反过来，始终反过来：把情况或问题颠倒过来，从反面看。

The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as in poetry.

Every discovery builds on the work of those who came before us.

我们必须接受失望，因为它是有限的，但千万不可失去希望，因为它是无限的。

数据库应该是现实的忠实模型，而不是对现实的扭曲。

一个人的富有程度与他能置之不理的事物的数量成正比。