trade places

(US)change places

(美)更换地方

trade down (或 up)

sell something in order to buy something similar but less (or more) expensive

为购买价格更低或更高的类似物而出售

trade something in

exchange a used article in part payment for another

以旧物折价贴换同类新物

she &B{traded in} her Ford &B{for} a Land Rover.

她把旧福特车折价添钱买了一辆“陆虎”越野车。

trade something off

exchange something of value, especially as part of a compromise

（尤指作为让步而）交换某物

the government &B{traded off} economic advantages &B{for} political gains.

政府以牺牲经济利益来换取政治好处。

trade down

To trade something in for something else of lower value or price

出售…以换取：卖掉某物以购入低价值或低价格的其它东西

bought a new, smaller car, trading the old one down for economy.

为了节约，卖掉了旧车买了一辆更小的新汽车

trade in

To surrender or sell (an old or used item), using the proceeds as partial payment on a new purchase.

以（旧货）抵购（新货）：放弃或卖掉（一旧的或用过的物品），将所得款项用作一购入物品的部分账款

trade on

To put to calculated and often unscrupulous advantage; exploit

利用：获得精心策划且通常无耻的利益；利用

children of celebrities who trade on their family names.

利用他们家庭名望的名人后代

trade up

To trade something in for something else of greater value or price

以（旧货）换购更高价值的物品：卖掉某物以购入高价值或高价格的其它东西

The value of our house soared, enabling us to trade up to a larger place.

我们这房屋的价值上扬，使得我们可以卖掉它购买一个更大的地方