发病机理

例句：

1. 1. The researcher discovered a new mechanism that could explain why the disease is so prevalent.
   研究人员发现了一种新的机制，可以解释为什么这种疾病如此普遍。
2. 2. The pathologist examined the tissue samples to understand the disease's pathogenesis.
   病理学家检查了组织样本，以了解疾病的发病机制。
3. 3. The doctor explained that the patient's symptoms were caused by an unidentified pathogenic agent.
   医生解释说，患者的病症是由一种未识别的致病因子引起的。