/treɪn/
名词
火车,列车
Did you come by train?
你是乘火车来的吗?
拖裙,裙裾
思路/一连串事件
What amazing train of thought led you from Napoleon to global warming?
是怎样的思路使你从拿破仑想到全球变暖?
想跟读,去练习