An idle youth，a needy age．
少壮不努力，老大徒伤悲。
An inch in a miss is as good as an ell．
为山九仞，功亏一溃。
A stitch in time saves nine．
亡羊补牢，贵在及时。
A true friend is known in the day of adversity．
苦难才能看出真正的朋友。
Birds of a feather flock together．
一丘之貉。Oil and water don't mix．
水火不相容。
Believe not all that you see nor half what you hear．
过耳之言，未可尽信。
Better early than late．
宁早勿迟。
Be slow choosing a friend；slower in chaning．
择友宜慎，弃友更宜慎。