in operation 1. 工作中，操作中；运转着 That new middle school has been in operation for several months. 那所新中学已开办好几个月了。 Nowadays there are a number of different systems in operation. 当前，实行着好几种不同的制度。 The style of dress is now in full operation. 那种衣服式样现正盛行。 2. 起作用，生效；实施中 The new rule has been in operation since Tuesday. 那条新规则从星期二起开始生效。 the law in operation 实施中的法律