double up double

例句：

1. 1. The sales doubled in the last quarter.
   销售额在上一季度翻了一番。
2. 2.If you double the amount of money, you'll have twice as much.
   如果你将金额翻一番，你就会有两倍的金额。
3. 3. She doubled her efforts to finish the project on time.
   她加倍努力以按时完成这个项目。