beforetimeadv.以前；从前beforeconj.在 ... 以前pref.在 ... 以前；在..前面adv.以前；以往；之前before-the-lens shutter镜前快门before evaluating for yield测定产量之前Before you empower the team写在你向团队授权之前before the foundation of PRC建国前Before friends all is mon.朋友之间应不分彼此.before the Anti -Japan war抗战前before the presence of sb.在某人的面前Before and after impoundment蓄水前后before one say Jack Robinson转眼之间,说时迟那时快before the Republic of China民国以前