Richard refused to trade in his old Canon cameras.理查德拒绝用他的旧佳能相机以旧换新。Vendors were doing a brisk trade in souvenirs.商贩们的纪念品生意很红火。the trade-in value of a car一辆汽车的以旧换新抵价...

用（旧物）贴换新物，出售，经营...

trade in的音标：trade in的英式发音音标为：[treid in]trade in的美式发音音标为：[treid ɪn]...