double cold reduction

例句：

1. 1. Weneed to double the number of workers tomeet the demand.
   我们需要增加工人的数量以满足需求。
2. 2. The price of oil has doubledsince last year.
   油价自去年以来已经翻倍了。
3. 3. He doubled his savings tobuy a new car.
   他加倍了他的储蓄来买一辆新车。