The most important thing in mathematics is to understand the concepts, not just to memorize the formulas.

我唯一确定的是我一无所知。

所有事物都是由土和水生成和成长的。

Man is so much the voice of his interest that it is not enough to make him see the right， but you must make him feel it.

我不是那种会让对球场的热爱减少的人。