有些人出现了哮喘。空气质量太差,一个指标,在加拿大超过50要发警告,尽量减少室外活动,北京的指标经常超过150。
有些人出现了哮喘。空气质量太差,一个指标,在加拿大超过50要发警告,尽量减少室外活动,北京的指标经常超过150。
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