buy the book

例句：

1. 1. I need to buy some groceries for dinner.
   我需要买些晚餐的杂货。
2. 2. They bought a new car last year.
   他们去年买了一辆新车。
3. 3. She bought the house for $500,000.
   她以50万美元的价格买下了这所房子。