If this does not kill the invader outright, then it ACTS as a flag for the bug in question to be eaten by a macrophage.

如果抗体不能马上杀死入侵者，则它将作为入侵者的一个标记，使得它们有可能被巨噬细胞所吞噬。

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When it sees a dangerous pathogen, part of the immune system is adaptive and can resist the invader even if it has never seen the agent before.

人体发现一个危险病原体时，部分免疫系统就会有所反应，并能抵抗入侵者，即使免疫系统之前从未遇到过类似的病原体。

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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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On Space Invader's Web site, you can see the many other cities where he has placed his art.

VOA: special.2009.04.08

If the invader chooses the hard pass he will lose one battalion of his army simply in getting over the mountains, simply in going through the hard pass.

如果侵略者选择崎岖的路,仅在穿越阿尔卑斯山的途中,他就要损失一个营的兵力,这就是选崎岖之路的代价

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So imagine the following example, an invader is thinking about invading a country, and there are two ways -- there are two passes if you like -- through which he can lead his army.

想象一下这样的例子,一个侵略者打算入侵一个国家,有两条路,想象成两个关口也行,侵略者必须通过一个才能进入

耶鲁公开课 - 博弈论课程节选

The invader appears to have no characteristic other than the ability to reproduce rapidly.

NEWYORKER: The Invasion from Outer Space

They may even rub their neck so that an elbow protrudes sharply toward the invader.

FORBES: Knowing When to Back Off

That happens when the antibody that is attached to the invader also attaches itself to an Fc-receptor molecule.

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