在一个国家中，一个公民的自由是对其他人的威胁。

我们必须平衡眼前的能源需求与长期的可持续性目标。

The goal of education is not to increase the amount of knowledge but to create the possibilities for a child to invent and discover, to create men who are capable of doing new things.

物理学家必须能够想象。