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