每一个挑战都是学习和成长的机会。

War is an ugly thing， but not the ugliest of things: the decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth a war， is much worse.

The history of mathematics is a history of human curiosity and ingenuity.

真正的领导者倾听多于发言，并以诚信为首要行动准则。