当随机化不可行时，匹配方法可以是一个强大的工具。

世人常因冀望遥远难及的幸福，忽略了眼前的小乐趣。

"I don’t make music for the critics. I make music for the people."

可持续性不仅仅是一种趋势；它是对后代的责任。

To be a Negro in America is to be in a constant state of rage.

It's perhaps easier now than ever before to make a good living. It's perhaps harder than ever before to stay calm, to be free of career anxiety. I want to look now, if I may, at some of the reasons why we might be feeling anxiety about our careers. Why we might be victims of these career crises, as we're weeping softly into our pillows. One of the reasons why we might be suffering is that we are surrounded by snobs.

教学的艺术不在于传授本领，而在于激励、唤醒和鼓舞。