Combinatorics is like the art of counting without actually counting.
组合数学就像是不用实际计数的计数艺术。
市场比政府更能高效地分配资源，但它并非完美无缺。
The lightning that precedes the thunder is a common image of the warnings that come before calamity.
We don’t inherit the ocean from our ancestors; we borrow it from our children.
——2013年4月19日，昂山素季会见奥巴马时说。