倍数总结：once --- 一倍 ; twice ---  两倍；三倍及三倍以上 --- “基数词 + times”

　　1. 倍数 + as + 形容词(原级) + as ...

　　例如：My school is twice as big as yours.

　　2. 倍数 + 形容词(比较级) + than ...

　　例如：This building is four times higher than that.

　　3. 倍数 + the size / length/ height / width... + of ...

　　例如：This building is four times the height of that.