在脊椎动物中，免疫系统提供了对体内寄生虫的多重防御。

In vertebrates, the immune system provides a multiple defense against internal parasites.

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在脊椎动物中，免疫系统提供了对体内寄生虫的多重防御。

In vertebrates, the immune system provides a multiple defense against internal parasites.

youdao