相对论不仅仅是一种科学理论，而且是一种哲学理论，它深刻地影响了我们对宇宙的概念。
我不是那种在关键时刻退缩的人。
When you want knowledge like you want air under water then you will get it.
The world is full of stories, and from time to time they permit themselves to be told.
