A word spoken is past recalling.一言既出，驷马难追。

A young idler, an old beggar.少壮不努力，老大徒伤悲。

A common danger causes common action. 同舟共济。

All time is no time when it is past. 机不可失，时不再来。

Custom makes all things easy. 习惯成自然。

Do not have too many irons in the fire. 贪多嚼不烂。

First impressions are half the battle. 先入为主。

He would climb the ladder must begin at the bottom. 千里之行始于足下。

I love you not because of who you are, but because of who I am when I am with you.

The time of life is short ; to spend that shortness basely, it would be too long .
人生苦短，若虚度年华，则短暂的人生就太长了。

Don’t gild the lily.
不要给百合花镀金/画蛇添足。

Don’t cry because it is over, smile because it happened.
不要因为结束而哭泣，微笑吧，为你的曾经拥有。

If winter comes , can spring be far behind ?( P. B. Shelley , British poet )
冬天来了，春天还会远吗？( 英国诗人, 雪莱. P. B.)

If you would hit the mark, you must aim a little above it. Every arrow that flies feels the attraction of earth. －Henry Wadsworth Longfellow.
要想射中靶，必须瞄准比靶略为高些，因为脱弦之箭都受到地心引力的影响。