倍数表达法：
A + 谓语+倍数+the +n.(size/ height/ length……)+of B
A + 谓语+倍数+as + abj.+ as B
A + 谓语+倍数+adj.比较级+than B A + 谓语+adj.比较级+than B+by+倍数
1).This square is twice the size of that one.
This square is twice as large as that one.
This square is once larger than that one.
2).This factory produced three times as many cars as they did 10 years ago.
3).He is 3 years older than I- He is older than I by 3 years