碎石术

例句：

1. 3.
   比喻
2. 1. She scraped the table to get the crumbs off.
   她把桌子擦干净，以便吃剩下的面包屑。
3. 2.The old car was too expensive to keep, so we decided to scrap it.
   这辆旧车太贵了，我们决定把它卖掉。
4. 3. They scraped together enough money for a new house.
   他们拼凑出足够的钱买了一所新房子。