一个爱国者必须时刻准备好在必要时捍卫国家免受政府的侵犯。

The teacher should not teach as if he were pouring knowledge into an empty vessel, but rather as if he were lighting a fire.

空间是一种关系存在的方式。

世界需要更多的森林，而不是更少。

The past is always tense, the future perfect.

数学之美不在于其复杂性，而在于其简洁性以及它揭示的关于宇宙的深刻真理。