double three legged gravity escapment

例句：

1. 1.The price of the product has doubledsince last year.
   该产品的价格自去年以来翻了一番。
2. 2. He doubled his efforts tofinish the project on time.
   他加倍努力，按时完成这个项目。
3. 3. She doubled hersavings to buy a new car.
   她加倍储蓄，买了一辆新车。