一、倍数增减的表示法

1) is 2.5 times greater than Force N2

(考点：倍数 形容词/副词比较级 than)

2) reacts three times as fast as the other one

(考点：倍数 as 形容词/副词 as)

3) is 49 times the size of the moon

(考点：倍数 名词)

4) wants to raise the rent by a third

(考点：动词 by 数词/百分比/倍数)

5) plan to double their investment

(考点：double 名词)