A non-productive cough does not expel sputum from the respiratory tract.
干咳指不从呼吸道排出痰液的咳嗽。
Cough-variant asthma is a type of asthma in which the main symptom is a dry, non-productive cough.
咳嗽变异性哮喘属于哮喘的一种，其主要症状是干咳。
A 54-year-old man presented with progressive dyspnea and non-productive cough. Drug toxicity, environmental exposure, and collagen vascular disease were ruled out.
男性，54岁，进行性呼吸困难、干咳。药物毒性，环境暴露，胶原血管疾病已经被排除。
A 54-year-old man presented with progressive dyspnea and non-productive cough. Drug toxicity, environmental exposure, and collagen vascular disease were ruled out.
男性，54岁，进行性呼吸困难、干咳。药物毒性，环境暴露，胶原血管疾病已经被排除。
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