制造链式反应机器的根本点当然是确保每次裂变产生一定数量的中子，其中一些中子将再次产生裂变。
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.
每个人都会承认，我们的思维、情感和想象力产生的观念，都是在心灵中存在的。
Resilience is built by adapting to change, not resisting it.
我只是在寻找快乐的方式。
Every seed planted today is an investment in tomorrow's food supply.
苏联是一个恐惧的文明，人们生活在持续的对夜间敲门声的恐惧中。