trade in
US /treɪd ɪn/
UK /treɪd ɪn/
短语动词
折价换购, 以旧换新
to give something old as part payment for something new
示例:
•
I'm going to trade in my old car for a new model.
我打算把旧车折价换购一辆新车。
•
You can often trade in your old phone when upgrading to a new one.
升级新手机时，你通常可以以旧换新。