Better deny at once than promise long. 

轻诺必寡信。

knowledge advances by steps and not by leaps. 

知识只能循序渐进，不能跃进。

Better be out of the world than out of fashion.

不合潮流不如脱离尘世。

learn wisdom by the follies of others.

从旁人的愚行中学到聪明。

to him that does everything in its proper time,one day is worth three.

事事及时做，一日胜三日。

Bed is a midicine.

睡好觉，如服药。

to save time is to lengthen life.

节省时间就是延长生命。

when an opportunity is neglected,it never comes back to you.

机不可失，时不再来;机会一过，永不再来。

A work ill done must be twice done.

未做好的活，需要重新做。

make hay while the sun shines.

晒草要趁太阳好。