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.
Sorrow is hushed into peace in my heart like the evening among the silent trees.
任正非内部讲话稿
The female body has been a battleground throughout history.