语法指导：as+形容词或副词原级+as

 　　语法指导：as+形容词或副词原级+as

　　在否定句或疑问句中可用so… as。

　　He cannot run so/as fast as you.

　　当as… as 中间有名词时采用以下格式。

　　as +形容词+ a +单数名词

　　as + many/much +名词

　　This is as good an example as the other is.

　　I can carry as much paper as you can..

　　用表示倍数的词或其他程度副词做修饰语时，放在as的前面。

　　This room is twice as big as that one.

　　Your room is the same size as mine.

　　)倍数+ as + adj. + as　=> 倍数+ then + of

　　This bridge is three times as long as that one.

　　This bridge is three times the length¹ of that one.

　　Your room is twice as large as mine.

　　Your room is twice the size of mine.

1 length   

n.长度，长；期间，一段；程度，范围

参考例句：

• We need a length of pipe.我们需要一节管子。
• The length of this pencil is 17-centimetre.这铅笔17厘米长。