bring a knife to a gunfight: To come poorly prepared or equipped for some task ,goal,competition,or confrontation.（對(duì)于某些任務(wù)，目標(biāo)，競爭或?qū)χ胖袦?zhǔn)備不充分）

例句：Make sure you have researched your position thoroughly and comprehensively before the debate.You don't want to bring a knife to a gunfight.? 你得確保自己在辯論開始前已經(jīng)完整透徹地研究過了自己的位置，你總不會(huì)想在槍戰(zhàn)的時(shí)候帶把刀子吧。