1、Did you get a good trade-in on your sewing machine?
你以舊縫紉機折價換新合算嗎？

2、We clean up the car at trade-in time.
拿舊車折價換新車時，我們把舊車清洗干凈了。

3、Did you get a good trade-in on your sewing machine
你以舊縫紉機折價換新合算嗎？

trade-in翻譯