##### 表示倍数
- 表示倍数
- 倍数用于表示某物的成倍数量, 可以用 times 或者特定的倍数词来表达
- twice: 两倍
- three times: 三倍
- four times: 四倍
- ten times: 十倍
- double: 双倍
- triple: 三倍
- 示例
- The price has doubled since last year. (价格自去年以来翻了一番)
- His income is three times mine. (他的收入是我的三倍)
- This box is three times as heavy as that one. (这个盒子是那个的三倍重)
- The price increased by four times. (价格上涨了四倍)