un out (of sth) (of a supply of sth) 是一个固定搭配,只有主动形式
（指供应品）用完,耗尽; （指人）用完,耗尽（供应品）:The petrol is running out/We are running out of petrol.汽油快用光了[我们的汽油快用光了].* Our time is running out/We are running out of time.我们剩下的时间不多了.* Could I have a cigarette?I seem to have run out (of them).给我一枝烟好吗?我的（烟）已经抽完啦.