Just an introduction to the classes of potential foreign invaders that our immune system tries to defend us against.

这只是对我们的免疫系统试图防御的潜在外来入侵者的分类介绍。

youdao

We must defend ourselves against the invaders.

我们必须防御入侵之敌。

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Later, the Han, Sui and Jin dynasties all repaired, rebuilt, or expanded sections of the great Wall at great cost to defend themselves against northern invaders.

后来的长城由汉，隋和晋朝以极大的代价来修理，改建或是扩建长城以捍卫自己免于北方的侵略。

youdao

So, just an introduction to the classes of potential foreign invaders that our immune system tries to defend us against.

所以 我只是简单介绍几类,免疫系统试图抵御的潜在外来侵略者

耶鲁公开课 - 生物医学工程探索课程节选

He even voted four times against legislation giving gun owners an affirmative defense when they use firearms to defend themselves and their families against home invaders and burglars.

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