当然学过
倍数表达法：
1） A + 谓语+倍数+the +n.(size/ height/ length……)+of B
例如：This square is twice the size of that one.
2） A + 谓语+倍数+as + abj. + as B
例如：This square is twice as large as that one
3）A + 谓语+倍数+adj. 比较级+than B
例如：He is 3 years older than I
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