Mathematics is not a spectator sport.
数学不是一项观赏性运动。
You’ve got to have models in your head. And you’ve got to array your experience—both vicarious and direct—on this latticework of models. You may have noticed students who just try to remember and pound back what is remembered. Well, they fail in school and in life. You’ve got to hang experience on a latticework of models in your mind.
强大的文化是强大公司的基础。
"The human voice is the most dangerous instrument."
我不是因为快乐而唱歌;我因为唱歌而快乐。
The speech we hear is an indication of that which we don't hear.