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。
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。
A violent species of alien invaders, they destroyed entire worlds in their quest to conquer the galaxy.
作为凶残的异族入侵者，它们摧毁一切阻挡它们征服全银河的星球。
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。
After the alien invasion of the earth, human beings know that these invaders will come back one day.
经历过外星人大举入侵地球后，人类知道，这些入侵者有一天一定会再回来。
After the alien invasion of the earth, human beings know that these invaders will come back one day.
经历过外星人大举入侵地球后，人类知道，这些入侵者有一天一定会再回来。
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