beforeconj.在 ... 以前pref.在 ... 以前；在..前面adv.以前；以往；之前Before he come他来以前before-imagen.前象before the law法律面前before serving发球前before journal改前杂志before days of在 ... 几天以前before sunrise日出前before contest赛前before seedtime播前before retiring就寝前； 睡前