Phlegm is the common pathogenic factor of lung disease.

痰是肺系疾病常见的致病因素。

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High level F in feed and soil was the main pathogenic factor of it.

土壤、饲料高氟是加重钙磷代谢障碍引发跛行的主要因素。

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High level F in feed and soil was the main pathogenic factor of it.

土壤、饲料高氟是加重钙磷代谢障碍引发跛行的主要因素。

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