underground是用in还是用on啊

问题描述

精选答案

in, on都可以用，还可以用byin underground:在地下The method has been gradually used in underground mines.该方法已逐步在地下矿应用。

on underground:在地下I frequently travel on the London Underground.我经常坐伦敦地铁。I always travel by underground.我总是乘地铁。The miners were trapped deep underground.矿工被困在地下深处。The train was trapped underground by a fire.列车被一场大火困在了地下。I don't travel on the underground late at night.我深夜不坐地铁。