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 2011-11-09

时间:2011-12-02 05:54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)

 Food is the body's fuel. Now a study finds that the amount of energy in that fuel can depend not just on its calorie content—but on how it's prepared. And the research, published in the Proceedings1 of the National Academy of Sciences, could explain an ancient leap in human evolution. 

 
Food's energy value is usually measured before consumption2. But Harvard scientists fed two groups of mice either meat or sweet potatoes and prepared the items differently: either whole or pounded, raw or cooked—to create a variety of diets. 
 
The researchers then measured the mice. They found that pounded meat and potatoes caused more weight gain than raw food. And that cooking increased weight the most. 
 
The extra calories cooking makes available may have allowed the survival3 of humans with larger bodies and more complex brains, starting almost two million years ago. Those physical changes required more energy, and exposing food to fire may have provided that boost4
 
Of course, a legacy5 of evolution is that modern humans often gain too much weight. Which might be called a raw deal.
 
Thanks for the minute. For Scientific American's 60-Second Science, I'm Sophie Bushwick.

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 consumption 3ZVym     
n.消费,消耗,消费额,消耗量,结核病
参考例句:
  • Consumption of oil has declined in recent years.石油消耗量在最近几年下降了。
  • The meat was condemned as unfit for human consumption.这种肉已被宣布不适宜人们食用。
3 survival lrJw9     
n.留住生命,生存,残存,幸存者
参考例句:
  • The doctor told my wife I had a fifty-fifty chance of survival.医生告诉我的妻子,说我活下去的可能性只有50%。
  • The old man was a survival of a past age.这位老人是上一代的遗老。
4 boost XtHzU     
n.鼓励,激励,提高;v.鼓励,使增强信心
参考例句:
  • This will be a great boost to the economy.这对于经济发展将是一个巨大的促进。
  • These changes will help to boost share prices.这些变化将有助于提高股票价格。
5 legacy 59YzD     
n.遗产,遗赠;先人(或过去)留下的东西
参考例句:
  • They are the most precious cultural legacy our forefathers left.它们是我们祖先留下来的最宝贵的文化遗产。
  • He thinks the legacy is a gift from the Gods.他认为这笔遗产是天赐之物。
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
(0)
0%
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