表达倍数时，两倍用twice/double, 三倍以上用基数词+times,常见的表达方式如下：

第一种：倍数+as…as型

例如：We have produced three times as many computers as we did last year.我们生产的计算机是去年的三倍多。

第二种：倍数+the size of 型

例如：China is almost five times the size of Mexico in area.在面积上，中国几乎是墨西哥的五倍大。

第三种：倍数+what从句

例如：The length of the road is twice what it was three years ago.这条路是三年前的两倍长。

第四种：倍数+比较级+than

例如：I am twice older than you. 我的年龄是你年龄的两倍。

第五种：比较级+ than…+ by+倍数

例如：The line is longer than that one by twice.这根绳子比那根长两倍。