The earth is 49 times larger than the moon.=The earth is 49 times as large as the moon.

这是倍数表达法啊,表达一样的意思啊 .
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
这个记得就行了.