trade-in value

例句：

1. 1.The company offered a trade-in discount for customers who brought in their old phones.
   该公司为顾客提供旧手机的折价回收服务。
2. 2. The trade-in value of the car is $500.
   这辆车的折价价值是500美元。
3. 3. The trade-in value of the old laptop was enough to cover the cost of a new one.
   那台旧笔记本电脑的折价价值足以支付一台新笔记本的费用。