倍数表达常用句型：
A is +倍数+as + 形容词原级+as +B.
A is +倍数+形容词比较级+than +B.
A is +倍数+the+ 名词（size / length / height...）+of +B.
如：这个房间是那个房间的三倍大.
This room is three times as big as that one.
This room is twice bigger than that one.
This room is three times the size of that one.