sell the book

例句：

1. 1. They soldtheir house for a good price.
   他们以好价钱卖掉了他们的房。
2. 2.The company is selling its products at a discount.
   该公司正在以折扣价出售其产品。
3. 3.She decided to sell her car to save money.
   她决定卖掉她的车来省钱。