It must be the country air 请问可不可以把the country air改成the country's air呢?为什么?

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• It must be the country air 请问可不可以把the country air改成the country's air呢?为什么?
• It must be the country air 请问可不可以把the country air改成the country's air呢?为什么?
• 为什么：there's less air pollution in the city than in the country.这里的than后面没有用that呢?the weather in wuhan is hotter than __that____in beijing.
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