It is neither contagious nor genetic, and no one knows what causes the permanent variety.
它既不传染也不遗传，没有人知道什么导致了它不停地变化。
Like "classic" or "typical" asthma, no one really knows what causes cough-variant asthma.
就像“典型”哮喘，没有人真正知道究竟是什么原因造成了咳嗽变异性哮喘。
Like "classic" or "typical" asthma, no one really knows what causes cough-variant asthma.
就像“典型”哮喘，没有人真正知道究竟是什么原因造成了咳嗽变异性哮喘。
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