The security dilemma is a fundamental feature of international politics, as states' efforts to increase their own security often decrease the security of others.

让我们只关注一个目标，即人类的福祉；让我们抛开语言、国籍或宗教方面的所有自私考虑。

Those who deny freedom to others, deserve it not for themselves; and, under a just God, can not long retain it.

教师的任务是引导学生从已知走向未知。

你不需要完美来激励别人。让人们从你如何处理你的不完美中获得灵感。

The most important thing is to have a child. Everything else is secondary.

最优雅的数学证明是那些以简单揭示真理的证明。