double Frank's mirror

例句：

1. 1.I doubled my efforts to finish the project on time.
   我加倍努力以按时完成这个项目。
2. 2. The company doubled its profits last quarter.
   该公司上个季度的利润翻了一番。
3. 3. She doubled her savings to buy a new car.
   她加倍她的储蓄来买一辆新车。