There are dark shadows on the earth, but its lights are stronger in the contrast.

UNIX非常简单，只需要一个天才来理解它的简单性。

激光对于阿秒物理学的意义，就像望远镜对于天文学的意义一样。

不经历风雨，怎么见彩虹。

The quality of an organization is determined by the quality of its products.

我不需要任何人的认可。