Quality is conformance to requirements, not goodness.

农业的可持续性不是一种选择，而是对后代子孙的必要责任。

一本书本身就是一个世界，一个在我们眼前展开的宇宙。

In times of crisis, the best leaders are those who remain calm and focus on solutions rather than problems.

解释：乌鸦聚集在一起，虽然看上去很和好，实际上并不亲密；不慎重地结交朋友，虽似牢固，终必破裂。

The true power of mathematics lies in its ability to simplify the complex, making the incomprehensible understandable.