地震是一种自然现象，而不是一种惩罚。
The study of black holes has led us to the edge of our understanding, where the known laws of physics break down and new theories must emerge.
目标不是永远活着，而是创造一些能够永存的东西。
The same principles which at first view lead to skepticism， pursued to a certain point， bring men back to common sense.