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The air inside a house has more contaminates than does pollu

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The air inside a house has more contaminates than does polluted outside air.请问可以这样理解吗:than在这里做主语,可是than是连词不能做主语.这是倒装句,还原成:than polluted outside air does,缺少宾语,than做宾语吗?可是than是连词不能做宾语,请问要怎么理解?
The air inside a house has more contaminates than does pollu
主语+动词/系动词+more +(形容词)……than……是固定搭配.
一般是主语的比较.比如:
Date is more important than study for him.
对于他而言,约会比学习更重要.(两个主语进行比较)
本句来说,意思是:与室外受污染的空气相比,房子里的空气有更多污染物.是主语的比较,固定词组,不要拆词理解就可以了