beforeconj.在 ... 以前pref.在 ... 以前;在..前面adv.以前;以往;之前
before the race赛前
before daylight在天亮前
Before analysis分析前
before the factadv.事前
before weeks of在 ... 数周以前
Before Sickness未病
before hours of在 ... 几小时以前
before it rains迨天之未阴雨
before planting播前
before all else首先