Thus, natural selection stabilized this host-parasite relationship.

因此，自然选择让这种寄主-寄生关系变得稳定。

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Parasitism is a kind of predator-prey relationship in which one organism, the parasite, derives its food at the expense of its symbiotic associate, the host.

寄生是一种捕食者与被捕食者之间的关系，寄生者利用共生伙伴——宿主来获取食物。

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Thanks to this parasite-host relationship, cancer can grow however it wants, wherever it wants.

正是基于这种寄生——宿主的这种关系，癌细胞才可以肆意生长。

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The scientists say a fuller understanding of the parasite-host relationship is required to help conservation efforts.

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