a method of buying something in which an article that one already owns is given as part of the payment for another, more expensive, article
部分抵价交易
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he sold the car in part exchange for another vehicle .他用部分抵价交易的方法卖掉自己的车,另外又买了一辆。
give or take (an article) as part of such a transaction
以…作部分抵价交易。