天下最痛苦的人是发现丈夫的勇敢只是虚张声势的妻子。

In computer science, we often deal with problems that are easy to state but hard to solve.

Every molecule tells a story, and catalysts help us write new chapters.

引力解释了行星的运动，但它无法解释是谁让行星运动起来的。