Natural selection is the only known natural process that can build functional complexity.

做数学就是探索一个思想的宇宙，唯一的限制是你的想象力。

Great engineering solves problems you didn't know you had in ways you don't understand.

刚强纯洁的高尚人品，要在烈火般艰苦的斗争中锤炼；惊天动地的丰功伟业，必须在薄冰般险恶的环境里前进。