20?我想没那个必要吧!倍数的表达是有几个固定形式的:
1.n.+be+倍数+as+adj.+as+n.;
2.n.+be+倍数+the+特定名词(如:size,weight,length等)+of+n.
3.n.+be+倍数+adj.的比较级+than+n.
This room is twice as large as that one.这间房子是那间的两倍大。
This room is twice the size of that one.
This room is three times larger than that one.这间房子是那间的三倍大。
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