trade in an old bicycle etc for a new one give sth to a seller as part payment for a new thing take the old car etc as a trade-in take the old car etc as part payment on a new one trade in sth old for a new thing
英語詞典收錄了最新的漢英詞典和英漢詞典，總共有200多萬個詞條，詞庫仍在不斷更新中。