孤独不是他人的缺席，而是自我的缺失。

压力要么让管道爆裂，要么造就钻石。

The key to sustainable growth is balancing economic progress with environmental responsibility.

The spread of liberal democracy around the world is not inevitable, but it is the most likely outcome.

教育是可持续林业的基础，人们保护他们所理解的事物。