真相很少纯粹，也绝不简单。

I'm not a teacher, I'm a student.

Legal rules are not merely commands backed by threats.

In computer science, the simplest solution is often the most elegant and effective.

破坏其土壤的国家就是自取灭亡。

每一本书都是一次旅程，每一次旅程都会改变你。