beforeconj.在 ... 以前pref.在 ... 以前;在..前面adv.以前;以往;之前
before thenadv.在这以前(那时以前)
before food食前
Before Adamn.《在亚当之前》;杰克·伦敦(Jack London)著
before game赛前
before long不久以后
before dawn黎明前
before dark天黑前
before live生前事
before meal饭前
before meals饭前服