It is also useful because the mold can be used over and over again to make exact copies of the ceramic form.

VOA: special.2009.09.09

If I'm talking about two DNA strands and they differ only in one or two base pairs they won't be exact complements and they won't form this double helix.

假设有两条DNA单链,有一两个碱基不能配对,它们就不能完全互补,也无法形成双螺旋形结构

耶鲁公开课 - 生物医学工程探索课程节选

So it can't be an equilibrium, the exact prediction of the Downs model, two guys right on top of each other is not an equilibrium.

所以它不可能是一个均衡,确切的当斯模型的预测,两个一样的候选人不是一个均衡

耶鲁公开课 - 博弈论课程节选

Burma's military is yet to announce when the exact date for the elections although analysts expect the vote, the first in 20 years, to be around October or November this year.

VOA: standard.2010.07.27

But how carefully you estimate will determine in part how good your ultimate records are so please try to be as careful as you can, and then pick the closest option if you can't find the exact food that you're eating at that time.

你估计的仔细程度,在某种程度上,也会决定最终结果的准确性,所以请尽可能谨慎,如果找不到完全对应的食物,请选择和你当时所吃食物最接近的选项

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Last time, I invited you to think about life on the experience machine, where the scientists are busy stimulating your brain in such a way as to give you an exact replica, from the insides of what it would be like having identical experiences to the ones you would have if you were really doing-- well, whatever it is that's worth doing.

上节课，我要你们思考,体验机里的生活，科学家们用它刺激你的大脑,给你一份完美的体验复制品，从体验相同的经历,到体验在现实生活中-,值得做的事情。

耶鲁公开课 - 死亡课程节选