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.

我们今天种下的每一粒种子都是对后代的承诺。

The power of science lies in its universality and selflessness, transcending the boundaries of nations and cultures.

在量子力学中，轨迹的概念失去了意义。