英语 英语 日语 日语 韩语 韩语 法语 法语 德语 德语 西班牙语 西班牙语 意大利语 意大利语 阿拉伯语 阿拉伯语 葡萄牙语 葡萄牙语 越南语 越南语 俄语 俄语 芬兰语 芬兰语 泰语 泰语 泰语 丹麦语 泰语 对外汉语

SSS 2012-03-26

时间:2012-04-16 06:20来源:互联网 提供网友:gmeng   字体: [ ]
特别声明:本栏目内容均从网络收集或者网友提供,供仅参考试用,我们无法保证内容完整和正确。如果资料损害了您的权益,请与站长联系,我们将及时删除并致以歉意。
    (单词翻译:双击或拖选)

 This is Scientific Americans 60 second Science, I am Christopher Intagliata, got a minute?

 
You've probably had the feeling. Your running shoes are pounding the pavement—then suddenly your pain
 
fades away, and you're feeling euphoric. The runner's high. But that biological perk1 may be limited to mammals that evolved for endurance exercise—like us. So says a study in the Journal of Experimental Biology. 
 
Researchers had humans and dogs—both natural-born runners—jog a half hour on a treadmill2. Then they sampled their blood for endocannabinoids, some of the compounds thought to trigger the runner's high. As expected, humans and dogs had much higher levels after the run. But when ferrets—a sedentary species—took the same 30-minute trot3, they had no spike4 in those feel-good molecules5.
 
The authors say that's because long-distance running could have helped our hunter-gatherer ancestors find more food—thus increasing their reproductive success. And they speculate that natural selection may have linked up a feel-good reward to that beneficial behavior. These days of course, this ancient trait won't help us find extra calories—but it may encourage us to run 'em off.
 
Thanks for the minute for Scientific Americans 60 second Science, I am Christopher Intagliata

点击收听单词发音收听单词发音  

1 perk zuSyi     
n.额外津贴;赏钱;小费;
参考例句:
  • His perks include a car provided by the firm.他的额外津贴包括公司提供的一辆汽车。
  • And the money is,of course,a perk.当然钱是额外津贴。
2 treadmill 1pOyz     
n.踏车;单调的工作
参考例句:
  • The treadmill has a heart rate monitor.跑步机上有个脉搏监视器。
  • Drugs remove man from the treadmill of routine.药物可以使人摆脱日常单调的工作带来的疲劳。
3 trot aKBzt     
n.疾走,慢跑;n.老太婆;现成译本;(复数)trots:腹泻(与the 连用);v.小跑,快步走,赶紧
参考例句:
  • They passed me at a trot.他们从我身边快步走过。
  • The horse broke into a brisk trot.马突然快步小跑起来。
4 spike lTNzO     
n.长钉,钉鞋;v.以大钉钉牢,使...失效
参考例句:
  • The spike pierced the receipts and held them in order.那个钉子穿过那些收据并使之按顺序排列。
  • They'll do anything to spike the guns of the opposition.他们会使出各种手段来挫败对手。
5 molecules 187c25e49d45ad10b2f266c1fa7a8d49     
分子( molecule的名词复数 )
参考例句:
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里,大分子裂变为小分子。
本文本内容来源于互联网抓取和网友提交,仅供参考,部分栏目没有内容,如果您有更合适的内容,欢迎点击提交分享给大家。
------分隔线----------------------------
TAG标签:   sss  托福素材
顶一下
(2)
100%
踩一下
(0)
0%
最新评论 查看所有评论
发表评论 查看所有评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:
听力搜索
推荐频道
论坛新贴