Poison-evil is one of important pathogenic factors, which canaffect human's body as exogenous factor or endogenous factor.
毒邪是一类重要的致病因素，既可由外侵入，又可由内而生。
The viewpoint supports that prophylactic cholecystectomy is necessary because chronic cholecystitis and cholelithiasis may be one of important pathogenic factors.
提出慢性胆囊炎、胆石症是胆囊癌的重要致病因素之一。因此作预防性病变胆囊切除术实有必要。
Conclusion in infant diarrhoea of spring, except indigestion, pathogenic bacteria and rotavirus are still more important etiological factors.
结论：春季婴幼儿腹泻中除消化不良性腹泻外，细菌和轮状病毒感染仍是较为重要的致病因素。
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