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These systems are dispersed throughout your body and their dispersal is important, and so we'll talk about that as well.
这些系统分布于人体各处,而这种分散性很重要,我们也会讲到这一点
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There's no point where the circulatory system crosses the boundary between being inside you and outside of you, it's totally internal.
循环系统绝不会,跨越人体的内外界限,它完全位于体内
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This is a bacterium that's normally present in humans; it colonizes all of our intestinal systems.
这种细菌在人体中很常见,栖居在我们所有人的肠道系统中
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Hopefully their immune systems will respond to it like the real virus but it won't be capable of replication because we've chemically cross linked it so it can't go through its life cycle.
人体的免疫系统,就会对该病毒产生免疫应答,但灭活的病毒不能复制,因为我们已经对它做了化学处理,使它无法进入生命周期
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This is a picture that I showed you before, but basically tells you something that you already know, that humans are made up of organ systems, organs and organ systems, those organs are composed of tissues.
这张图我给你们看过,简单的说明了一些常识,即人体由器官系统构成,器官和器官系统,其中器官由组织组成
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So, these memory cells are a way that your immune system keeps track of antigens that it's been exposed to for even if maybe the plasma cells that were producing antibody in response to the initial exposure have died and disappeared.
所以,这些记忆细胞,是人体免疫系统记忆抗原的一种方法,即使由浆细胞产生的抗体,在初次免疫应答中全部被消灭,记忆细胞仍然能迅速分化为抗体分泌细胞
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Here, I've just picked a couple of the pictures that I showed you last time when we were talking about cell communication in the immune system, What happens after the vaccine is introduced into your body is that it initiates cellular events.
我挑选了,我上次给你们展示的几幅图片,当我们讨论到,免疫系统中的细胞沟通时,讲到过当人体接种疫苗之后,能够触发,细胞活动
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The other thing that I want to do today is try to tie this discussion on vaccines a little bit more closely with what we talked about last week, in terms of what happens inside your body when you receive a vaccine or when you're exposed to an antigen, and how the immune system actually responds to that.
还有就是,我希望可以,把今天关于疫苗的讨论,与我们上周讲过的内容,结合得更紧密一些,当接种疫苗,或者是接触抗原时,人体将会发生怎样的变化,以及免疫系统对疫苗产生何种应答
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