表示倍数的常用句型有下列几种，如：
1. … times + n./pron.
e.g. The earth is 49 times the size of the
moon.
The volume of the sun is about 1,300,000
times that of the earth.
2. … times + as + adj./adv.
e.g. It is four times as big as Europe.
We have three or four times as many
as we can use.
3. … times + comparative + (than)
e.g. The output of steel was more than 2.5
times greater.
This car runs three times faster than
that one.
4. v. + (by) + … times
e.g. During this period, its territory increased five
times.（扩大了４倍，是原来的５倍）
Since 1970, the town has expanded by three
times.
表示两倍的数一般用twice，如：
He runs twice as fast as his brother
does.
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Nouns
