trade in
以旧换新, 买卖
例句与用法：
The jewellery firm is just a front for their illegal trade in diamonds.
该珠宝公司不过是进行非法的钻石交易的幌子。
The company was granted a charter trade in the occupied territory.
这家公司被授予特权，可以在被占领地区进行贸易活动。
The gas company is offering fifty pounds off a new cooker if you trade in your old one.
如果你用旧厨灶来折价的话，那家煤气公司愿以减价50英镑出售一套新厨灶。
The old trade in black ivory is on more.
昔日非洲黑奴的买卖已不复存。
trade intrade in1.■用(旧物)贴换新物He traded an old bicycle in for a new one.他把旧的自行车折价换了一辆新车。2.■出售, 经营He trades in wool and cotton.他经营羊毛和棉花。
trade in1.■[美国英语]2.■做…买卖；做…生意；从事…：They trade in furs and skins.他们做皮货生意。to trade in chemical fertilizer经营化肥3.■以(旧汽车等)折价抵付同类新物的部分价金；用…抵货款：She traded in her old refrigerator for a new one.她以旧冰箱折价添钱买了一台新冰箱。
见:trade: trade in
trade in
名词 trade in:
an item of property that is given in part payment for a new one
同义词：trade-in
动词 trade in:
turn in as payment or part payment for a purchase
同义词：trade