自动控制的根本问题是在存在干扰的情况下维持期望状态。

简帛研究为我们打开了了解古代中国思想世界的窗口。

Fishery modernization is not a slogan, but a goal that requires down-to-earth efforts.

The greatest threat to our forests is not logging, but indifference.

当我不会演戏时，我被要求演戏。当我不会唱歌时，我被要求唱

The first duty of the sovereign， that of protecting the society from the violence and invasion of other independent societies， can be performed only by means of a military force.