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SSS 2010-11-03

时间:2010-12-07 06:05来源:互联网 提供网友:lp6135   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 Karen Hopkin. This will just take a minute.
Maybe your dad said, “The harder you work for something, the more you’ll appreciate it.” Well, father really did know best, because a new study finds that the harder mice have to work for a treat, the better it tastes. The research appears in the Proceedings1 of the Royal Society.
Mice were trained to push levers to get either of two rewards. Press one lever, out comes a drop of sugar water. Press the other and they get a drop of different tasting sugar water.
Then things got interesting. For one of the treats, scientists gradually increased the amount of effort required for the payoff—from one lever-press to five, then 10, then 15. So by the end of the session, one type of sugar water cost 15 times more effort than the other.
The mice then retired2 to their home cage where both treats were freely available. And they showed a strong preference for whichever reward they’d worked harder to obtain. Based on how fast the mice sipped3, they appeared to find the costlier4 sugar water more tasty, which makes evolutionary5 sense. An animal wouldn’t survive if a little hard work left a bitter taste in its mouth.
Thanks for the minute. For Scientific American’s 60-Second Science, I’m Karen Hopkin.


点击收听单词发音收听单词发音  

1 proceedings Wk2zvX     
n.进程,过程,议程;诉讼(程序);公报
参考例句:
  • He was released on bail pending committal proceedings. 他交保获释正在候审。
  • to initiate legal proceedings against sb 对某人提起诉讼
2 retired Njhzyv     
adj.隐退的,退休的,退役的
参考例句:
  • The old man retired to the country for rest.这位老人下乡休息去了。
  • Many retired people take up gardening as a hobby.许多退休的人都以从事园艺为嗜好。
3 sipped 22d1585d494ccee63c7bff47191289f6     
v.小口喝,呷,抿( sip的过去式和过去分词 )
参考例句:
  • He sipped his coffee pleasurably. 他怡然地品味着咖啡。
  • I sipped the hot chocolate she had made. 我小口喝着她调制的巧克力热饮。 来自辞典例句
4 costlier 9067c5d7e93fbe2b149ad5ab98ac6019     
adj.昂贵的( costly的比较级 );代价高的;引起困难的;造成损失的
参考例句:
  • Alligator skin is five times more costlier than leather. 鳄鱼皮比通常的皮革要贵5倍。 来自互联网
  • Disagreements among creditors can be costlier still. 债权人之间的分歧会加大重组的费用。 来自互联网
5 evolutionary Ctqz7m     
adj.进化的;演化的,演变的;[生]进化论的
参考例句:
  • Life has its own evolutionary process.生命有其自身的进化过程。
  • These are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。
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