The person who has lived the most is not the one with the most years but the one with the richest experiences.

The fundamental point in fabricating a chain reacting machine is of course to see to it that each fission produces a certain number of neutrons and some of these neutrons will again produce fission.

试管婴儿的研究是出于帮助不孕夫妇的愿望。

完成事情的最好方法就是简单地开始。