We'll talk about how that happens a little bit as we go through here.

随后我们会讲得更详细一些
Generally,

大体上
you think about the immune system protecting

你们会认为免疫系统使
against different classes of pathogens

我们免受不同种类病原体的侵害
and several classes of pathogens are shown on this table.

这个表格里介绍了几类病原体
So, you're familiar with some of these bacteria like salmonella,

所以你们很熟悉像沙门氏菌这样的细菌
or the micro bacterium that causes tuberculosis are shown here.

或者像这儿的引起结核的小细菌
Viruses, you know about viruses; variola,

病毒你们都知道病毒像天花病毒
we're going to talk about next week which causes smallpox,

我们下周会讲的引起天花的病毒
influenza, which causes the flu

还有引起流感的流感病毒
and HIV of course which cause AIDS are some examples.

引起艾滋病的人类免疫缺陷病毒等等
Fungi which don't often cause infections in people

真菌在免疫系统健康的情况下通常