trade in

以旧换新； 买卖

International trade in edible insects would almost certainly increase.(食用昆虫的国际贸易几乎肯定会大为增长。)

He urged the revival of the slave-trade in the late 1850s, and he developed a theory of what he called warranteeism.(他在19世纪50年代后期力促奴隶贸易的复兴，并提出了一种他称之为担保主义的理论。)

Can a buyer and seller trade in such a situation?(那么销售者和消费者能否在这种情况下达成交易呢？)

Futures do not trade in shares like stocks.(期货交易不像股票那样分发股份。)

Want to work in the wig trade in Texas?(想在德克萨斯从事假发行业？)

Two years ago we banned trade in shark fins on all our sites.(两年前，阿里巴巴集团下面所有的网站被禁止交易鱼翅。)

Vendors were doing a brisk trade in souvenirs.(小贩们的纪念品生意很兴隆。)

The two kings went into trade in partnership.(两位国王开始合伙做生意。)

Rising prices fuel the trade in fakes and also lead to more grave-robbing.(高涨的价格也令赝品交易火上浇油，还引起更多盗墓行径。)

“We say settlements are illegal, so how can we trade in illegal goods?” asks one.(一个人问道，“我们说定居点是非法的，那么我们怎么能对非法产品进行交易呢？”)

verb

1. turn in as payment or part payment for a purchase

e.g. trade in an old car for a new one

Synonym: trade

1. 以(旧物)折价贴换同类新物
If you trade in an old car or appliance, you give it to the person you are buying a new one from so that you pay less.

e.g. He had a Rolls-Royce, and he traded it in for two matching silver Range Rovers...
他有辆劳斯莱斯，他把它折价贴换了两辆外形相配的银色路虎车。
e.g. 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。