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科学美国人60秒 SSS Evolution, stem cells and the National Inventors Hall of Fame

时间:2017-06-20 03:29来源:互联网 提供网友:nan   字体: [ ]
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Welcome to the Scientific American podcast. I am Steve Mirsky. In this inaugural1 edition of the podcast, we'll talk with John Rennie, the editor in chief of Scientific American magazine, about the crisis in cloning and its implications for stem cell research. Also joining us is Eugenie Scott. She is the director of the National Center for Science Education and was involved in the recent historic Dover, Pennsylvania, evolution trial. And we'll talk to Rini Paiva of the National Inventors Hall of Fame. On February 8th, they announced their inductees for 2006 and while those names might not be familiar to everyone, their inventions definitely are. Along with those interviews, we'll throw some Hall of Fame trivia at you and we'll hear some clips from the CSI show you are never going to see on television. Thanks for joining us here on the Scientific American podcast.

First up: cloning in crisis.

Steve: We're at the offices of Scientific American and I'm talking to John Rennie, the editor in chief of the magazine.

John, there's been really a scandal in the cloning world of late.

Rennie: Yes! That's right! Everyone is completely outraged2 by the recent discovery surrounding the work of the Korean stem cell researcher, Dr. Woo Suk Hwang. Dr. Hwang's work really made major headlines around the world in 2004 and 2005, because of [a] couple of different papers that he had published, in which he had shown that he was first able to clone human embryonic3 stem cells and later produce lines of embryonic stem cells cloned from individual patients. However, now based on studies from the Seoul National University and the panel investigating the evidence, it now becomes quite clear that Dr. Hwang seemed to have faked much of this research.

Steve: And what's going to happen to him?

Rennie: Needless to say, his scientific reputation is completely in tatters. He's already resigned at least some of his academic positions. I think really probably for him one of the biggest questions now is whether or not he is going to become the subject of criminal prosecution4 possibly for mishandling government funds.

Steve: This cloning scandal has political ramifications5 in terms of stem cell research, right?

Rennie: Oh sure. Stem cell research has been very politically charged for years now. So I'm afraid that this sort of scandal surrounding Dr. Hwang's works are really is only going to energize6 some of that further. There are a number of people who always argued that embryonic stem cell work was unacceptable for different ethical7 or religious reasons. They are probably going to point to what's happened in Dr. Hwang's lab and as evidence that lot of the stem cell researchers really can't be trusted and that they certainly can't be trusted to do this kind of work ethically8. However, I think, it is important to say that most of the scientific communities doesn't see any of this bad work done by Dr. Hwang as reflecting badly on the science of stem cells at all.

Steve: But in terms of actually getting the mechanisms9 going to do stem cell research, this could be a problem?

Rennie: That's certainly one of the big concerns; embryonic stem cell research has been very politically charged for years now. When you try to look at the political problems of stem cell research you really have to look at it at least two levels—the federal level and then what's going on down at the level of the states. At the federal level, the administration has stood by the policy it established back early in the Bush administration of saying that in effect the federal funds for embryonic stem cells would be limited to work only on certain lines of stem cells that were grandfathered in. The states—most notably10 California—have stepped into this and have started to put lot of money toward this. California has now basically become the leading stem cell research funder in the world by its decision to put 3 billion dollars over the course of ten years [in]to this [research].

Steve: Because the restrictions11 on stem cell research in this country are federal, but at the state level you're pretty much free to do what you want. Is that right?

Rennie: That's basically right. Yes, the states are moving and trying to write their own rules. Now there is always a question of whether there could be some sort of federal legislation that could restrict that further; but some people feel that in a lot of ways much of the political discussion about this is in some respects over and basically the weight of stem cell research has moved to the states and the federal government is not likely to move back in and try to take this over soon.

Steve: Thanks, a lot John.

Rennie: Thank you Steve.

Steve: For more on cloning and ethics12 and lots of other topical science, check out the Scientific American blog at blog.sciam.com; that's blog.s-c-i-a-m.com.

It's a little mind numbing13 to think about all the inventions you are using right now while you are listening to this podcast, either on your computer or your MP3 player. Well! On February 8th, the National Inventors Hall of Fame announced their new inductees, the people who made the modern world … modern. I called Rini Paiva of the National Inventors Hall of Fame at her office in Akron, Ohio.

Steve: Hi, Ms. Paiva. Very good to talk to you today.

Paiva: Thanks, it's good to talk to you as well.

Steve: Tell us about the National Inventors Hall of Fame first and what you have to do to get in.

Paiva: Well! The National Inventors Hall of Fame is actually an organization that has been around since early 1970s, and ever since then we've been honoring outstanding inventors. And for someone to be inducted into the Hall of Fame, that person must have a U.S. patent and then—very importantly—that patent must be something that has bettered our society in someway and made our lives better.

Steve: Who decides who gets in?

Paiva: Well! We actually have a National Selection Committee that takes a look at all of our nominees14 for the year. This is comprised of people from, you know, different scientific fields—all experts of course—and they are the ones who make the recommendation to us.

Steve: So, and the person does not have to be alive. You can get in for something you invented 200 years ago?

Paiva: You can (laughs) as long as a patent was issued for it. You could be either a living person or a deceased person.

Steve: Let's talk about some of the inductees who are actually alive and the kind of work that they did that we probably use on a daily basis and might not be aware of.

Paiva: Sure. Well, you know, one of the things that I don't know about you, but I use everyday is the Internet; and, you know, we always think about where did the Internet really come from? Well! In fact there were two individuals by the name of Robert Kahn and Vincent Cerf who were the ones who came up with the protocol15 that allows the Internet to run. It allows us to talk to each other via e-mail, to search the Worldwide Web, to do everything that we are used to today.

Steve: Some of the other living inductees include …

Paiva: Well! Something that a lot of people have been enjoying these days are their new digital cameras; and one of the inventions this year is one that's been done by Willard Boyle and George Smith, they are the inventors of the charged couple device. Now a lot of people have not heard of the charged couple device or the CCD, but it's actually the device that allows digital imaging to happen. It really dramatically advanced digital imaging and you're going to find it not just in digital cameras but in anything else that takes a digital image [whether it]where there is something as every day as a fax machine to something as big as a telescope like the Hubble, taking pictures of space.

Steve: Some people might be walking around wearing the products of one of this year's inductees and some people might have the products of one of this year's inductees inside of them right now.

Paiva: Robert Gore16 is one of this year's inductees and he came up with a product that is now known by the Gore-Tex brand. And everyone can think of course things like Gore-Tex outerwear that protects you from the elements and Gore-Tex is used for so many other things as well.

Steve: So you have the Internet protocol?

Paiva: Yeah!

Steve: And you have a Gore, but it's not Al Gore.

Paiva: No, but it's not Al Gore. (laughs) You know, I've been waiting for people to make those comments. (laughs)

Steve: And the fellow who invented something people might have inside them?

Paiva: Well! That's a person by the name of Julio Palmaz and he is a physician who is actually working—believe it or not—at a lab at home and he picked up this piece of metal up off the floor and he was experimenting with it and he realized that he could make a good intravascular stent. Now that's kind of a big—you know, a lot of people might not realize what the intravascular part is, but the stent part people have heard of; and a lot of people—over a million people actually every year—have had stents implanted in them to unclog their arteries17.

Steve: So it's still possible to actually invent something in your basement or come up with the idea in your basement and it becomes a viable18 invention.

Paiva: You know what? We see it all the time. We definitely see people who have done their work in the corporate19 R&D labs and their work is phenomenal; and we've seen the people who literally20 have come up with their ideas with the materials that they found in their basement or the garage.

Steve: When are the actual induction21 ceremonies?

Paiva: Well! We're looking forward to the induction ceremonies on May 5th and 6th because they are going to be taking place at the National Inventors Hall of Fame in Akron, Ohio.

Steve: And I have been there, and it's also a fun museum to chomp22 around[check out]; and so if you are in the area, I recommend dropping by for the ceremony and checking out the museum. And just 20 miles down the road you have the Football Hall of Fame—you can make it an all-Hall-of-Fame weekend.

Paiva: We do; there is a lot of Hall of the Fame all around us.

Steve: What else is there?

Paiva: The Rock and Roll Hall of Fame is in Cleveland.

Steve: Oh—that's only about 50 miles away, right?

Paiva: They are all very close to each other—within an hour's drive of each other.

Steve: Terrific. Thanks very much, Ms. Paiva.

Paiva: Oh you're welcome.

Steve: For more information, go to www.invent.org. And if you are an inventor yourself, you'll probably be interested in checking out the various competitions that the Hall of Fame sponsors. There are categories for graduate students, undergrads and regular folks who might just be coming up with the next great invention right at home.

Now it's time for some Hall of Fame trivia. There is one person who has been elected to both the National Inventors Hall of Fame and to the Rock and Roll Hall of Fame. Here is a hint. If you are a Beatles fan, his name might be considered the opposite of "more John"; and here is another hint—he holds patent number 3018680 for his invention of the solid body electric guitar in 1941, and his legendary23 recording24 of "How High the Moon" was number one on the charts in 1951. Guitarist extraordinaire Les Paul is still plucking along at age 90.

Next up, Eugenie Scott, the director of the National Center for Science Education. She is the country's number one defender25 of evolution in the classroom, and I called her at her office in Oakland, California.

Steve: Hi, Dr. Scott.

Scott: Hi [there]dear Steve.

Steve: Tell me about why the Dover evolution/intelligent design case was so important?

Scott: Oh, the Dover case was a very important case because it was the first time that the idea of intelligent design had to have its day in court. And of course as scientists would predict, intelligent design laws—it is not science and it's not legal to teach it.

Steve: A scientist might predict that, but you might not have necessarily been sure that a judge would find that way; and this judge found that way in a blistering26 fashion, that the decision that he issued was really scathing27 against the defendants28 who were the school board who wanted idea in the classroom.

Scott: Oh, absolutely. The judge could have ruled very narrowly. He had enough evidence that the purpose of the school board was to promote religion when they passed the policy, and he could have struck it down on that ground alone, but he didn't. He went on; he had listened to the scientific testimony29. In fact, he had listened very carefully and very attentively30 to the scientific testimony, and he decided31 that the claims of the defense32 that intelligent design was science and therefore there was a secular33 reason to teach it were—[he] found that there was no science behind intelligent design and the only reason for presenting it was to promote a religious—a sectarian religious—[view];hue [it] was a wonderful decision from our standpoint.

Steve: Now hot on the heels of that decision, another case cropped up that was very similar and that was out where you are in California.

Scott: That's right! A case in southern California in the El Tejon School District where a high school teacher decided that she would offer a course on intelligent design on a four-week inter-session part of the semester; and with the distinction that the El Tejon course was going to be held in philosophy rather than in the science curriculum.

Steve: And that sounds okay. It's okay to talk about intelligent design in public schools as long as you don't present it as science, is that right?

Scott: Not exactly; and the operant where[operative word] there is, about—you said, talk about intelligent design. And that's the key difference. Of course, you can describe religious ideas in the public school curriculum, and it's appropriate, but you can't advocate or promote these ideas; and that was the problem with the El Tejon intelligent design. I think the title of the course was "Philosophy of Intelligent Design". That was the problem here.

Steve: And that case has now also been resolved?

Scott: Yes! On January 17th, the district court judge signed an agreement between the plaintiffs—who were parents in the district—and the school district agreeing that the course would be cancelled. This is a victory for good science education.

Steve: This result in California, do you think that that is a direct result of the judge's decision in Pennsylvania?

Scott: I think the judge's decision in Pennsylvania was a real wake-up call for school districts around the country who are contemplating34 teaching intelligent design. Whether it's in the science curriculum or outside of the science curriculum, it is unconstitutional to promote a religious idea.

Steve: And we're talking about in public schools?

Scott: Correct.

Steve: Okay. Thanks very much. I really appreciate it.

Scott: You're welcome.

Steve: Do you watch CSI, Dr. Scott?

Scott: No, I'm sorry, I see very little television, but I do know what the program is about.

Steve: Well! We have some clips from the CSI program that you'll never see on TV.

Scott: (laughs) Well! That would be worth tuning35 in for.

Steve: This week on the new hit series, CSI: Reality.

Male voice: Rebecca I sent some trace evidence samples to you. I need you to do a mass spec on sample A.

Rebecca: We don't have a mass spec.

Male voice: Then let's do a gas chromatography on sample B.

Rebecca: We don't have one of those either, gas chrome photography[chromatography].

Male voice: Can we run the fingerprints37 through the National Database?

Rebecca: Yes! Although the fingerprint36 guys are on vacation this week and we have the state database, but it doesn't interphase with all the other states, so ….

Male voice: Okay! Okay! Well, let's at least run the DNA38 we recovered.

Rebecca: Okay! We send out DNA; we'll get it back in about a month.

Steve: Next week on CSI Reality

Voice 1: I'm entering the house now. My flashlight is broken.

Voice 2: Hey chief, why don't you just, you know, switch the lights on?

Steve: That's it for this edition of the Scientific American podcast. I'm Steve Mirsky. Thanks for clicking on us.


点击收听单词发音收听单词发音  

1 inaugural 7cRzQ     
adj.就职的;n.就职典礼
参考例句:
  • We listened to the President's inaugural speech on the radio yesterday.昨天我们通过无线电听了总统的就职演说。
  • Professor Pearson gave the inaugural lecture in the new lecture theatre.皮尔逊教授在新的阶梯讲堂发表了启用演说。
2 outraged VmHz8n     
a.震惊的,义愤填膺的
参考例句:
  • Members of Parliament were outraged by the news of the assassination. 议会议员们被这暗杀的消息激怒了。
  • He was outraged by their behavior. 他们的行为使他感到愤慨。
3 embryonic 58EyK     
adj.胚胎的
参考例句:
  • It is still in an embryonic stage.它还处于萌芽阶段。
  • The plan,as yet,only exists in embryonic form.这个计划迄今为止还只是在酝酿之中。
4 prosecution uBWyL     
n.起诉,告发,检举,执行,经营
参考例句:
  • The Smiths brought a prosecution against the organizers.史密斯家对组织者们提出起诉。
  • He attempts to rebut the assertion made by the prosecution witness.他试图反驳原告方证人所作的断言。
5 ramifications 45f4d7d5a0d59c5d453474d22bf296ae     
n.结果,后果( ramification的名词复数 )
参考例句:
  • These changes are bound to have widespread social ramifications. 这些变化注定会造成许多难以预料的社会后果。
  • What are the ramifications of our decision to join the union? 我们决定加入工会会引起哪些后果呢? 来自《简明英汉词典》
6 energize GpyxN     
vt.给予(某人或某物)精力、能量
参考例句:
  • It is used to energize the city.它的作用是为城市供给能量。
  • This is a great way to energize yourself and give yourself more power!这种方法非常棒,可以激活你的能量,让你有更多的活力!
7 ethical diIz4     
adj.伦理的,道德的,合乎道德的
参考例句:
  • It is necessary to get the youth to have a high ethical concept.必须使青年具有高度的道德观念。
  • It was a debate which aroused fervent ethical arguments.那是一场引发强烈的伦理道德争论的辩论。
8 ethically CtrzbD     
adv.在伦理上,道德上
参考例句:
  • Ethically , we have nothing to be ashamed about . 从伦理上说,我们没有什么好羞愧的。
  • Describe the appropriate action to take in an ethically ambiguous situation. 描述适当行为采取在一个道德地模棱两可的情况。
9 mechanisms d0db71d70348ef1c49f05f59097917b8     
n.机械( mechanism的名词复数 );机械装置;[生物学] 机制;机械作用
参考例句:
  • The research will provide direct insight into molecular mechanisms. 这项研究将使人能够直接地了解分子的机理。 来自《简明英汉词典》
  • He explained how the two mechanisms worked. 他解释这两台机械装置是如何工作的。 来自《简明英汉词典》
10 notably 1HEx9     
adv.值得注意地,显著地,尤其地,特别地
参考例句:
  • Many students were absent,notably the monitor.许多学生缺席,特别是连班长也没来。
  • A notably short,silver-haired man,he plays basketball with his staff several times a week.他个子明显较为矮小,一头银发,每周都会和他的员工一起打几次篮球。
11 restrictions 81e12dac658cfd4c590486dd6f7523cf     
约束( restriction的名词复数 ); 管制; 制约因素; 带限制性的条件(或规则)
参考例句:
  • I found the restrictions irksome. 我对那些限制感到很烦。
  • a snaggle of restrictions 杂乱无章的种种限制
12 ethics Dt3zbI     
n.伦理学;伦理观,道德标准
参考例句:
  • The ethics of his profession don't permit him to do that.他的职业道德不允许他那样做。
  • Personal ethics and professional ethics sometimes conflict.个人道德和职业道德有时会相互抵触。
13 numbing ae96aa62e5bdbc7fc11dd1b0f158c93e     
adj.使麻木的,使失去感觉的v.使麻木,使麻痹( numb的现在分词 )
参考例句:
  • Watching television had a numbing effect on his mind. 看电视使他头脑麻木。
  • It was numbing work, requiring patience and dedication. 这是一种令人麻木的工作,需要有耐心和忘我精神。 来自辞典例句
14 nominees 3e8d8b25ccc8228c71eef17be7bb2d5f     
n.被提名者,被任命者( nominee的名词复数 )
参考例句:
  • She's one of the nominees. 她是被提名者之一。 来自超越目标英语 第2册
  • A startling number of his nominees for senior positions have imploded. 他所提名的高级官员被否决的数目令人震惊。 来自互联网
15 protocol nRQxG     
n.议定书,草约,会谈记录,外交礼节
参考例句:
  • We must observe the correct protocol.我们必须遵守应有的礼仪。
  • The statesmen signed a protocol.那些政治家签了议定书。
16 gore gevzd     
n.凝血,血污;v.(动物)用角撞伤,用牙刺破;缝以补裆;顶
参考例句:
  • The fox lay dying in a pool of gore.狐狸倒在血泊中奄奄一息。
  • Carruthers had been gored by a rhinoceros.卡拉瑟斯被犀牛顶伤了。
17 arteries 821b60db0d5e4edc87fdf5fc263ba3f5     
n.动脉( artery的名词复数 );干线,要道
参考例句:
  • Even grafting new blood vessels in place of the diseased coronary arteries has been tried. 甚至移植新血管代替不健康的冠状动脉的方法都已经试过。 来自《简明英汉词典》
  • This is the place where the three main arteries of West London traffic met. 这就是伦敦西部三条主要交通干线的交汇处。 来自《简明英汉词典》
18 viable mi2wZ     
adj.可行的,切实可行的,能活下去的
参考例句:
  • The scheme is economically viable.这个计划从经济效益来看是可行的。
  • The economy of the country is not viable.这个国家经济是难以维持的。
19 corporate 7olzl     
adj.共同的,全体的;公司的,企业的
参考例句:
  • This is our corporate responsibility.这是我们共同的责任。
  • His corporate's life will be as short as a rabbit's tail.他的公司的寿命是兔子尾巴长不了。
20 literally 28Wzv     
adv.照字面意义,逐字地;确实
参考例句:
  • He translated the passage literally.他逐字逐句地翻译这段文字。
  • Sometimes she would not sit down till she was literally faint.有时候,她不走到真正要昏厥了,决不肯坐下来。
21 induction IbJzj     
n.感应,感应现象
参考例句:
  • His induction as a teacher was a turning point in his life.他就任教师工作是他一生的转折点。
  • The magnetic signals are sensed by induction coils.磁信号由感应线圈所检测。
22 chomp NrAzV     
v. (人、动物进食时)大声地咬,嚼得很响
参考例句:
  • I lost a tooth while chomping on a French baguette!我啃法棍面包时,崩掉了一颗牙!
  • They just chomp on tundra, nap a few hours and feast again.它们只是在苔原上大嚼特嚼,睡上几小时,接着再吃。
23 legendary u1Vxg     
adj.传奇(中)的,闻名遐迩的;n.传奇(文学)
参考例句:
  • Legendary stories are passed down from parents to children.传奇故事是由父母传给孩子们的。
  • Odysseus was a legendary Greek hero.奥狄修斯是传说中的希腊英雄。
24 recording UktzJj     
n.录音,记录
参考例句:
  • How long will the recording of the song take?录下这首歌得花多少时间?
  • I want to play you a recording of the rehearsal.我想给你放一下彩排的录像。
25 defender ju2zxa     
n.保卫者,拥护者,辩护人
参考例句:
  • He shouldered off a defender and shot at goal.他用肩膀挡开防守队员,然后射门。
  • The defender argued down the prosecutor at the court.辩护人在法庭上驳倒了起诉人。
26 blistering b3483dbc53494c3a4bbc7266d4b3c723     
adj.酷热的;猛烈的;使起疱的;可恶的v.起水疱;起气泡;使受暴晒n.[涂料] 起泡
参考例句:
  • The runners set off at a blistering pace. 赛跑运动员如脱缰野马般起跑了。
  • This failure is known as preferential wetting and is responsible for blistering. 这种故障称为优先吸湿,是产生气泡的原因。 来自辞典例句
27 scathing 2Dmzu     
adj.(言词、文章)严厉的,尖刻的;不留情的adv.严厉地,尖刻地v.伤害,损害(尤指使之枯萎)( scathe的现在分词)
参考例句:
  • a scathing attack on the new management 针对新的管理层的猛烈抨击
  • Her speech was a scathing indictment of the government's record on crime. 她的演讲强烈指责了政府在犯罪问题上的表现。 来自《简明英汉词典》
28 defendants 7d469c27ef878c3ccf7daf5b6ab392dc     
被告( defendant的名词复数 )
参考例句:
  • The courts heard that the six defendants had been coerced into making a confession. 法官审判时发现6位被告人曾被迫承认罪行。
  • As in courts, the defendants are represented by legal counsel. 与法院相同,被告有辩护律师作为代表。 来自英汉非文学 - 政府文件
29 testimony zpbwO     
n.证词;见证,证明
参考例句:
  • The testimony given by him is dubious.他所作的证据是可疑的。
  • He was called in to bear testimony to what the police officer said.他被传入为警官所说的话作证。
30 attentively AyQzjz     
adv.聚精会神地;周到地;谛;凝神
参考例句:
  • She listened attentively while I poured out my problems. 我倾吐心中的烦恼时,她一直在注意听。 来自《简明英汉词典》
  • She listened attentively and set down every word he said. 她专心听着,把他说的话一字不漏地记下来。 来自《简明英汉词典》
31 decided lvqzZd     
adj.决定了的,坚决的;明显的,明确的
参考例句:
  • This gave them a decided advantage over their opponents.这使他们比对手具有明显的优势。
  • There is a decided difference between British and Chinese way of greeting.英国人和中国人打招呼的方式有很明显的区别。
32 defense AxbxB     
n.防御,保卫;[pl.]防务工事;辩护,答辩
参考例句:
  • The accused has the right to defense.被告人有权获得辩护。
  • The war has impacted the area with military and defense workers.战争使那个地区挤满了军队和防御工程人员。
33 secular GZmxM     
n.牧师,凡人;adj.世俗的,现世的,不朽的
参考例句:
  • We live in an increasingly secular society.我们生活在一个日益非宗教的社会。
  • Britain is a plural society in which the secular predominates.英国是个世俗主导的多元社会。
34 contemplating bde65bd99b6b8a706c0f139c0720db21     
深思,细想,仔细考虑( contemplate的现在分词 ); 注视,凝视; 考虑接受(发生某事的可能性); 深思熟虑,沉思,苦思冥想
参考例句:
  • You're too young to be contemplating retirement. 你考虑退休还太年轻。
  • She stood contemplating the painting. 她站在那儿凝视那幅图画。
35 tuning 8700ed4820c703ee62c092f05901ecfc     
n.调谐,调整,调音v.调音( tune的现在分词 );调整;(给收音机、电视等)调谐;使协调
参考例句:
  • They are tuning up a plane on the flight line. 他们正在机场的飞机跑道上调试一架飞机。 来自《简明英汉词典》
  • The orchestra are tuning up. 管弦乐队在定弦。 来自《现代汉英综合大词典》
36 fingerprint 4kXxX     
n.指纹;vt.取...的指纹
参考例句:
  • The fingerprint expert was asked to testify at the trial.指纹专家应邀出庭作证。
  • The court heard evidence from a fingerprint expert.法院听取了指纹专家的证词。
37 fingerprints 9b456c81cc868e5bdf3958245615450b     
n.指纹( fingerprint的名词复数 )v.指纹( fingerprint的第三人称单数 )
参考例句:
  • Everyone's fingerprints are unique. 每个人的指纹都是独一无二的。
  • They wore gloves so as not to leave any fingerprints behind (them). 他们戴着手套,以免留下指纹。 来自《简明英汉词典》
38 DNA 4u3z1l     
(缩)deoxyribonucleic acid 脱氧核糖核酸
参考例句:
  • DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
  • Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。
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TAG标签:   科学美国人60秒  英语听力  sss
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