Nothing spoils a romance so much as sense of humour in the woman—or the want of it in the man.

A clear mission gives direction and purpose to every action.

写作是记住，但记住也是遗忘。

The study of L-functions is a window into the hidden structure of numbers.

法律的概念是复杂的，不仅涉及规则，还涉及原则、政策和标准。