人类是囊性棘球蚴病的偶然宿主，肝脏及肺是最常受累的器官。

Humans are accidental hosts of cystic echinococcosis, and the liver and lungs are the most frequently involved organs.

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研究人员相信，肿瘤不是在每个新宿主身上都获取新的线粒体，而是用来取代有问题的线粒体的一种偶然的修复机制。

The researchers believe that the cancer does not take up new mitochondria with every new host, rather that this functions as an occasional repair mechanism to replace faulty mitochondria.

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它选择宿主往往是偶然、随机不可测的。

Its choice of the vulnerable host is often arbitrary.

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