The world is like a chessboard， whereon we may see a living knight， but we cannot see a living chess.

文学是人类灵魂的镜子。

"In the end, we will remember not the words of our enemies, but the silence of our friends."

The world is indeed full of peril, and in it there are many dark places; but still there is much that is fair, and though in all lands love is now mingled with grief, it grows perhaps the greater.

置信区间理论提供了一种不同于点估计和假设检验的估计未知参数的方法。

我们并不拥有土地，我们是从子孙那里借来的。