The cause and pathogenesis of phlegm disease are summarized and classified.
分门别类的总结了痰病的病因和发病机制。
Up to now, the cause and pathogenesis are still unknown, and there isn't any effective therapeutic methods.
目前为止，本病的病因及发病机制仍不清楚，亦无有效治疗手段。
The prevention and treatment of CHS are difficult problems, because the cause and pathogenesis of the illness are still unknown.
由于其发病原因、发生机制目前不清楚，所以其预防及治疗一直是一个难点问题。
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