英语倍数表达式其中一项主语+谓语+倍数(或分数)+ as + adj.+ as一定要用adj.能不能用adv.或者as

the earth is 49 times as big as the moon.big是形容词.
如果要用副词,前面就要用动词
a puma runs 5 time as fast as a deer.fast是副词
as adj.a/an n.as没看懂 as beautiful a girl as?
mary is as beautiful as rose.就可以了