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SSS 2011-07-14

时间:2011-08-09 03:56来源:互联网 提供网友:gmeng   字体: [ ]
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    (单词翻译:双击或拖选)

 This is Scientific American’s 60-Second Science. I’m Steve Mirsky. Got a minute?

 
Former major league pitcher1 Antonio Alfonseca had six fingers on each hand. One of his coaches was once asked about the consequences of Alfonseca having six fingers and replied, “He can’t flip2 you off.” Think about it.
 
Well, neither can many moles4, because most individuals of the type called talpid moles also apparently5 have six fingers on each foot. Or at least it looks that way. Now a study shows that they really only have the regular old five true fingers. The real thumb looks like the other four fingers, and what appears to be the thumb is actually a much larger-than-normal version of the radial sesamoid bone of the wrist. The finding is in the Royal Society journal Biology Letters. 
 
The fake thumb has no joints6, a dead giveaway that it’s not a real finger. And molecular7 markers show that the five true fingers develop together in a mole3 embryo8, with the outsized sesamoid cropping up later. The arrangement is probably an advantage for an animal that spends a lot of time digging and doesn’t convey displeasure with hand signals.
 
Thanks for the minute. For Scientific American’s 60-Second Science, I’m Steve Mirsky.

点击收听单词发音收听单词发音  

1 pitcher S2Gz7     
n.(有嘴和柄的)大水罐;(棒球)投手
参考例句:
  • He poured the milk out of the pitcher.他从大罐中倒出牛奶。
  • Any pitcher is liable to crack during a tight game.任何投手在紧张的比赛中都可能会失常。
2 flip Vjwx6     
vt.快速翻动;轻抛;轻拍;n.轻抛;adj.轻浮的
参考例句:
  • I had a quick flip through the book and it looked very interesting.我很快翻阅了一下那本书,看来似乎很有趣。
  • Let's flip a coin to see who pays the bill.咱们来抛硬币决定谁付钱。
3 mole 26Nzn     
n.胎块;痣;克分子
参考例句:
  • She had a tiny mole on her cheek.她的面颊上有一颗小黑痣。
  • The young girl felt very self- conscious about the large mole on her chin.那位年轻姑娘对自己下巴上的一颗大痣感到很不自在。
4 moles 2e1eeabf4f0f1abdaca739a4be445d16     
防波堤( mole的名词复数 ); 鼹鼠; 痣; 间谍
参考例句:
  • Unsightly moles can be removed surgically. 不雅观的痣可以手术去除。
  • Two moles of epoxy react with one mole of A-1100. 两个克分子环氧与一个克分子A-1100反应。
5 apparently tMmyQ     
adv.显然地;表面上,似乎
参考例句:
  • An apparently blind alley leads suddenly into an open space.山穷水尽,豁然开朗。
  • He was apparently much surprised at the news.他对那个消息显然感到十分惊异。
6 joints d97dcffd67eca7255ca514e4084b746e     
接头( joint的名词复数 ); 关节; 公共场所(尤指价格低廉的饮食和娱乐场所) (非正式); 一块烤肉 (英式英语)
参考例句:
  • Expansion joints of various kinds are fitted on gas mains. 各种各样的伸缩接头被安装在煤气的总管道上了。
  • Expansion joints of various kinds are fitted on steam pipes. 各种各样的伸缩接头被安装在蒸气管道上了。
7 molecular mE9xh     
adj.分子的;克分子的
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。
  • For the pressure to become zero, molecular bombardment must cease.当压强趋近于零时,分子的碰撞就停止了。
8 embryo upAxt     
n.胚胎,萌芽的事物
参考例句:
  • They are engaging in an embryo research.他们正在进行一项胚胎研究。
  • The project was barely in embryo.该计划只是个雏形。
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