请同学们帮我分析一下这个句子,……andamong70-year-oldstherearetwiceasmanywomenasmen.这句话的意思我已经知道了,七十岁时女人的数量是男人的两倍.但后面的twiceasmanywomenasmen.是什么句型呢?

Question

请同学们帮我分析一下这个句子,
……and among 70-year-olds there are twice as many women as men.
这句话的意思我已经知道了,七十岁时女人的数量是男人的两倍.
但后面的twice as many women as men.是什么句型呢?
能不能各位同学用句型或者语法帮我分析一下?

Answer 1

1.as...as意为"和……一样",表示同级的比较.使用时要注意第一个as为副词,第二个as为连词.其基本结构为：as+ adj./ adv.+as.例如：
(1)This film is as interesting as that one.这部电影和那部电影一样有趣.
(2)Your pen writes as smoothly as mine.你的钢笔书写起来和我的一样流畅.
其否定式为not as/so +adj./ adv.+as.例如：
This dictionary is not as/so useful as you think.这本字典不如你想象的那样有用.
若有修饰成分,如twice,three times,half,a quarter等,则须置于第一个as之前.例如：
Your bag is twice as expensive as mine.你的袋子比我的贵一倍.
2.倍数表示法
第一个as的前面可以加上表示倍数的词、或是某些副词修饰语：twice ,( three ) times ,nearly ,almost ,just ,exactly ,not nearly（根本不）,by no means（绝不）,quite 等等.例如：
Asia is four tomes as large as Europe.亚洲有欧洲的四倍大（亚洲比欧洲大三倍）.
James is not nearly as tall as Robert.詹姆斯根本没有罗伯特高.
Cast iron is almost as useful as steel.铸铁差不多与钢一样有作用.
She hasn't been quite so unlucky as she pretends.她还没有象她常装出的那样不幸.