形容词和副词比较级的倍数表达法
1.倍数+as...as
2.倍数+比较级+than
3.倍数+the+名词+of
如：
This bridge is three times as wide as that one.（这座桥是那座桥的三倍宽.）
=This bridge is twice wider than that one.（这座桥比那座桥宽两倍.）
=This bridge is three times width of that one.（这座桥的宽度是那座桥的三倍.）