double line

例句：

1. 1. The company doubled its profitslast quarter.
   这家公司上个季度的利润翻了一番。
2. 2. She doubled her efforts to finishthe project on time.
   她加倍努力，按时完成了这个项目。
3. 3. The price of oil hasdoubled since last year.
   自去年以来，油价已经翻了一倍。