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.

这世上没有什么是我害怕说出口的。

Every breakthrough in laser technology brings us closer to solving mysteries that have puzzled scientists for decades.

成功不是终点，失败也非致命，重要的是继续前进的勇气。