及鋒而試

- （比喻趁著(zhù)士氣旺盛時(shí)使用軍隊，也比喻趁著(zhù)有利的時(shí)機行動(dòng)） Try while the point is sharp.; attack when army kept up high morale; come up to the tip of a bayonet and try; Strike the iron while it is hot.