double bridge

例句：

1. 1. The price of the product has doubled since last year.
   该产品的价格自去年以来翻了一番。
2. 2. He doubled his effortsto finish the project on time.
   他加倍努力，按时完成了这个项目。
3. 3. Shedoubled her savings tobuy a new car.
   她加倍储蓄，买了一辆新车。