before的意思是prep.之前;在…以前;在…面前(或前面);(次序或排列)在前面。conj.在…以前;到…为止;到…之前;以免;不然。adv.以前;过去;已经。例句1.Test the heat of the water before getting in. 入水之前先试一试水温。2.Before you is a list of the points we have to discuss. 放在你面前的是一份我们要讨论的要点清单。3.Now get going before I blow your head off. 赶快给我走，不然我打掉你的脑袋。
