Elizabeth Blackburn and Jack Szostak discovered the exact order of genetic information that protects chromosomes from ruin.

VOA: special.2009.12.08

So what this means is that unlike s orbitals, they don't have the exact same shape at any radius from the nucleus.

这意味着和ｓ轨道不同，它们在离原子核不同距离处的形状不是完全一样的。

麻省理工公开课 - 化学原理课程节选

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

By comparing rings from different trees and with other historical data, you can often identify particular rings with the exact calendar year that they grew.

VOA: standard.2010.04.05

These are phony claims meant to divide us,". In the Republican Party response, Congressman Tom Price from the Southern state of Georgia says Mr.Obama is not telling the exact truth about health care.

VOA: standard.2009.08.22