What is done cannot be undone. 覆水难收。
Wine in， truth out. 酒后吐真言。
You are only young once. 青春只有一次。
You cannot burn the candle at both ends. 蜡烛不可两头燃。(鱼和熊掌不可兼得。)
You cannot have your cake and eat it. 有得就有失。(事难两全其美。)
You never know till you have tried. 事非经过不知难。
Youth will be served. 青春好作乐。
Zeal without knowledge is a runaway horse. 无知的狂热是脱缰的野马。
