In vertebrates, the immune system provides a multiple defense against internal parasites.
在脊椎动物中，免疫系统提供了对体内寄生虫的多重防御。
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It is always an internal cleanse that gets to the core of what is ailing us and getting rid of parasites is no exception.
总是要有一次内在的清理，才能到达是什么在一直折磨我们的核心所在，而驱除寄生虫也并不例外。
The hedgehogs are housed in a shed where they are treated for ticks, fleas and internal parasites.
BBC: Charity started for Cambridgeshire hedgehog hospital
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