今天对自由民主最严重的威胁不是来自外部，而是来自内部。

Patience is key in observational astronomy—some discoveries take decades to confirm.

"To write is to breathe, and to breathe is to live."

The competition of enterprises is, in the final analysis, the competition of talents.

自然知识的改进者绝对拒绝承认所谓的权威。