It is never too late to mend 亡羊补牢，犹为未晚。

After a storm comes a calm 雨过天晴。

It is good to learn at another man's cost 前车之鉴。

A plantmay produce new flowers; man is young but once 花有重开日，人无再少年。

What may be done at any time will be done atno time 明日待明日，明日不再来。

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只有看不见而已

I am a slow walker, but I never walkbackwards. 我走得很慢，但是我从来不会后退。

Birds of a feather flock together. 物以类聚，人以群分。