1）倍数表示法
a. 主语+谓语+倍数（或分数）+ as + adj. + as
I have three times as many as you. 我有你三倍那么多。
b. 主语+谓语+倍数（分数）+ the size (amount，length…) of…
The earth is 49 times the size of the moon. 地球是月球的49倍。
c. 主语+谓语+倍数（分数）+ 形容词（副词）比较级+ than…
The grain output is 8 percent higher this year than that of last year.
今年比去年粮食产量增加8%。
This room is three times as big as that one.这间房的大小是那间房的3倍.
This room is three times bigger than that one. 这间房比那间房大三倍.(也就是这间房的大小是那间房的4倍.)
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