And the threat to native species from alien invaders is growing, the experts warned.

专家们强调，外来入侵物种对土著物种的威胁正在扩大。

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But if they are already there, the issue is how to manage the alien invaders, "MacKinnon says."

但如果它们已经在当地存在了，问题就是如何管理这些外来入侵物。

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These cells recognise alien invaders, chop them up and then carry characteristic bits of them to the rest of the immune system so that the invader can be recognised and appropriate measures taken.

这些细胞识别并处理外来异物，再把异物的特有信息提呈给后续的免疫系统使之能够识别并采取适当措施予以处理。

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