过去从未死去。它甚至不是过去。

The journey of a thousand miles begins with a single step.

数学的目标是使简单的复杂化，使复杂的简单化。

PAC学习框架提供了一种正式的方法来分析学习算法的效率和有效性。

I must confess that I never could see any beauty in her. Her face is too thin; her complexion has no brilliancy; and her features are not at all handsome. Her nose wants character; there is nothing marked in its lines. Her teeth are tolerable, but not out of the common way; and as for her eyes, which have sometimes been called so fine, I could never see anything extraordinary in them.

我不是怪胎。我生来如此。