根据回流压力的变化规律，采取异型排气口、预进气结构等措施减小回流冲击。
The change of back-flow pressure, deformed exhaust hole, pre-inflow structure and so on can be adopted to reduce back-flow impact.
目的探讨咳嗽变异型哮喘（CVA）肺功能气道弹性阻力和肺泡灌洗液（BALF）细胞学以及细胞因子变化的特征。
Objective To study the characteristics of airway elastic resistance and changes of cytologicals, cytokines in bronchoalveolar lavage fluid (BALF) in patients with cough variant asthma (CVA).
目的通过观察服药前后咳嗽的变化和肺功能的情况，评价疏风宣肺汤治疗咳嗽变异型哮喘的临床疗效。
Objective To evaluate the clinical medical effect of Shufeng Xuanfei Tang on cough variant asthma by observing the changes of cough and the situation of lung function before and after treatment.
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