病理学研究疾病发生的原因及引起患者临床各种症状和体征的机制。

Pathology involves the investigation of the etiology of disease as well as the pathogenesis that results in the clinical signs and symptoms of the patient.

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一项新的研究发现衰老、停滞的细胞在机体积聚是衰老相关疾病发生的原因。

The accumulation of old, stagnant cells in the body is to blame for some age-related diseases, a new study has found.

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因此，癌症是一种人造疾病，其原因是环境污染以及我们的饮食习惯和生活方式发生了变化。

So it has to be a man-made disease, down to pollution and changes to our diet and lifestyle" caused particular consternation.

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The other is that some places where the disease occurs the governments are not stable, or there might be civil unrest or civil wars and that makes it very difficult to orchestrate giving vaccines when there's other things happening in the country that are of more immediate concern.

另一个原因是,一些疾病发生地区,当地的政局不那么稳定,或者有动乱和内战,当在一个国家内发生许多,突发应急事件的时候,疫苗的分派发放会变得非常困难

耶鲁公开课 - 生物医学工程探索课程节选