n.折价物;折合价;作价提交的货品;夹有折价物的交易;
例句:
the trade-in value of a car
一辆汽车的以旧换新抵价
My father carries on a trade in silk.
我父亲经营丝绸生意.
They trade in their car every four years.
他们每隔3年就以旧汽车贴换新车.