证据分析：还不知道限制热量的摄入能最大的延长瘦人的生命或预期寿命。

EVIDENCE SYNTHESIS: It is not known whether calorie restriction extends maximum life span or life expectancy in lean humans.

youdao

关于经济情况不要守口如瓶孩子不用知道家庭预算的每个细节，但是如果他们不知道限制是怎么来的，他们又怎么能接受限制呢？

Don't be secretive about finances Children need not know every detail of the family budget, but how can they accept limitations unless they know where the limits come from?

youdao

我知道你必须阅读图书馆的预约书籍，而且这有时间限制。

I know that you have to read reserve books in the library and that you have time limits.

youdao

It takes advantage of the specificity of the restriction enzymes, the fact that we know what the gene sequence that we're looking for, and using this technological process of electrophoresis to identify changes that we predict.

这个方法利用了限制酶特有的性质,我们知道我们在找什么样的基因序列,从而才能利用电泳这个技术流程,来识别出我们预计的情况

耶鲁公开课 - 生物医学工程探索课程节选