经验始终是收费高的学校，然而，笨汉非进此学校不可。(美国总统 富兰克林 B )
Experience more than sufficiently teaches that men govern nothing with more difficulty than their tongues. (Bendict de spinoza, Dutch philosopher)
Expreience keeps a dear school, yet fools will learn in no other. (Benjamin Franklin, Americna president)