译文：亲近贤臣，疏远小人，这是西汉兴盛的原因;亲近小人，疏远贤臣，这是东汉衰败的原因。

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.

世界是一个迷宫，我们都在试图找到出路。