The desert teaches you the value of water and the meaning of silence.

The journey of solving a mathematical problem is as important as the solution itself, for it teaches us patience, persistence, and the joy of discovery.

我们都以幸福为目标生活；我们的生活各不相同，却又相同。

国家是理性的行为体，它们寻求最大化相对权力，以确保在竞争性的国际体系中生存。

实现明天的唯一限制将是我们今天的怀疑。