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。

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.

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对于动物来说，常见共生伙伴就是生活在其肠道内的细菌等微生物。

In the case of animals, these partners tend to be microorganisms like intestinal bacteria.

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狗是人类共生的伙伴。

"The dog became a symbiotic partner with us," he says.

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