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来源:雅诚德英语网
Epidemiological studies have shown that symptoms of bronchitis in asthmatic children increase in association with long-term exposure to NO2.
流行病学研究表明,哮喘儿童发生支气管炎症状的增多与长期接触二氧化氮有关。
Epidemiological studies have shown that symptoms of bronchitis in asthmatic children increase in association with long-term exposure to NO2.
流行病学研究表明,哮喘儿童发生支气管炎症状的增多与长期接触二氧化氮有关。