The prevalence of persistent cough and phlegm is the highest in heavy pollution area and decreases with pollution reducing.
重污染区内持续咳嗽、持续咳痰的现患率最高，并随着污染程度的降低呈下降趋势。
Chinese medicine, Coltsfoot Flower of warm spicy, can be lungs through, with the lungs and under the gas, the effectiveness of cough and phlegm.
中医以为，款冬花性温味辛，可入肺经，拥有润肺下气、止咳化痰的成就。
Control group was given continuous low flow oxygen, antibiotics, asthma and cough and phlegm and maintaining water and electrolyte acid-base balance and other conventional treatment.
对照组给予持续低流量吸氧、抗感染、平喘、止咳化痰及维持水电解质酸碱平衡等常规治疗。
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