顾犬补牢

Explanation: Metaphor things go wrong, should be in time to remedy. 　　Usage: -Linked; for the predicate; metaphor things go wrong, should be in time to remedy 　　Source: Han Liu Xiang "Warring States Chu policy four": "see the rabbit and the care of dogs, not too late to; lost sheep and fill in prison, not to late too." Thesaurus:  take measures in time, There is still time to mend, Zhicuojiugai Antonym Group:  Have no choice but Or ease, By iron is hot, against time, speed is precious in war, seize every minute and second, Time and tide wait for no man, Cut the Gordian knot, Broken mess knife, Now (in the time) or never!, seize a chance, Time and tide wait for no man., The mill cannot grind with the water that is past., Opportunity knocks but once., avail oneself of Hydration mud, a speedy fight dispatch