倍数：“两倍”用twice/double，“三倍以上”用“基数词+times”，常用句型有：

　　①　倍数+as...as

　　Eg：We have produced four times as many computers as we did last year.

　　②　倍数+比较级+than

　　Eg: His uncle is twice older than he.

　　She has read three times more books than I have.

　　③　倍数+the+名词+of: 常见名词有size, height, length, depth, age, width, weight等

　　Eg: China is almost five times the size of Mexico in area.

　　编辑推荐：

       中考各科目重点知识汇总