train

　　train在教材中用作名词,意思为火车,列车。

　　train除了以上用法外,还有以下几种用法。

　　Ive trained my dog to fetch my slippers. (train用作动词,意思为培养,训练。)

　　His telephone call interrupted my train of thought. (train of thought是固定短语,意思为思路,思绪。)

　　He trained his camera on the birds. (train sth. on / at sth. / sb. 意思为用对准或瞄准某事物或某人。)