临阵磨刀

Explanation: Pro: to, about; array: battlefield. When going into battle to fight gun knife grinding 　　Usage: -Linked; as predicate, attributive; containing derogatory 　　Source: Qing Cao Xueqin's "Dream of Red Mansions" at 70 back: "'crash course' is useless; with which the child anxious, obsessed write every day, how many can not finish?" 　　Examples: ~ Is not useful, only by the usual efforts. Thesaurus:  unaware? unprepared, to dig a well when thirsty, repair a leak in mid-stream, Regret of the Mo and, Before battle begins Polish, Patients to call heaven, not dig a well until one thirsty— — not make timely preparations Antonym Group:  peradventure, for caution's sake, throw one's weight about, prepared for any eventuality, in case (of) contingency, casualness, (of parents) to bring up cihldren for the purpose of being looked after in old age, The idea that day, used for one day, Support troops for a thousand days in the moment, Device 2 is not deficient, because of the possibility of sth happening, be ever prepared, Store is no sore., count on one's cards, make providence, be precautious beforehand, nip (crush,check) the matter in the bud, like a dog threatening other people on the strength of its master’ s power, Rainy day, economise, nip in blossom, prevent