on prep.在...之上；由...支撑着；在（某一天）；关于；基于adv.穿着；向前（移动)；表示持续性adj.表示已连接、处于工作状态或使用中；发生；值班
双语例句
The juvenile offender was released from custody on condition that he should find a job immediately and stay out of trouble for six months. 那个年轻的罪犯已从拘留所释放，条件是：他应该马上打一份工作，六个月内不得惹事生非。
I'll come on condition that John is invited too. 如果约翰也受到邀请，我就来。
Medieval system, where land was grant by a king to his aristocracy, and by the aristocrat to the peasant, on condition that each pay a service( or feudal duty) to his superior. 一种中世纪的制度：国王将土地转让给贵族，贵族再转让给农民。条件是每个人必须向他上级服役或交税。
I will go abroad on condition that my husband goes with me. 如果我丈夫能和我一起去，我就出国。
