trade in以旧换新； 买卖traden.贸易；交易；行业；同行；顾客；营业额；交易量v.做生意；从事贸易；购物；营业；(在证券交易所)交易；交换trade condition贸易条件trade agreementn.(国际)贸易协定；劳资协议；雇用舍同trade-in sale以旧换新的买卖trade directory行名录,同业名录trade increases贸易增长trade assistant[经] 营业员, 营业助理tradebrand name商品名trade expansion贸易扩张trade liability商业负债Trade documents外贸单证