出处：按学科分类—语言、文字 中国对外翻译出版公司《汉英成语词典》第102页（279字）
形容忘恩负义的人，例他全凭李某的介绍才能进这家公司工作，怎料他过河拆桥，得势后反将李某赶走。
That he was able to join this company was due entirely to Mr．Li．Who would believe that once in a top position，he would actually drop his bencfactor and go so far as to throw him out．