成功不是终点,失败也不是致命的:重要的是继续前进的勇气。
It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is most adaptable to change.
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.