用英语表达"A 是 B 的 N 倍长（宽,高,大,重等）","A 比 B 长（宽,高,大,重等）N 倍" 或"A 的长度（宽度,高度,大小,重量等）是 B 的 N 倍",可用下列几种句型.
1."A + be + 倍数 + as + 计量形容词原级 + as + B".
This tree is three times as tall as that one.这棵树是那棵树的三倍高.
His father is twice as old as he.他父亲的年纪有他两倍大.
2."A + be + 倍数 + 计量形容词比较级 + than + B "
The Yangtze River is almost twice longer than the Pearl River.
长江差不多比珠江长两倍.
The dictionary is exactly five times more expensive than that one.
这本字典比那本恰好贵5倍.
3."A + be + 倍数 + the + 计量名词 + of + B "
The newly broadened square id four times the size of the previous one.
新扩建的广场是未扩建时的四倍大.
4."The + 计量名词 + of + A + be + 倍数 + that + of + B "
The size of the newly broadened square is four times that of the previous one.
新扩建的广场为以前的四倍大.
5.其它
I'm twice/ double his age.我的年龄是他的两倍.
I've paid five times the usual price for the stamp.
我出了5倍于往常的价格买这枚邮票.
The average income of the staff has been increased by 50 percent compared with last year.与去年相比,该单位职工的收入增加了50%.
The price of TVs are twofold( adj.两部分的,双重的) down over these years.
近几年来,电视机的价格下降了两倍.