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So, not just a spectrum of viruses, but there's viruses and bacteria and parasites and other microorganisms that can cause disease.
所以,不是只有病毒,还有病毒,细菌,寄生虫,和其它各种微生物都能导致疾病
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If you're a bacterium your whole life is about swimming to nutrients and running away from things that would kill you.
假如你是一个细菌,你的一生将会在追逐养分,和逃避敌害中度过
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The study of immunology is the study of mechanisms that your body uses to protect itself from mainly from foreign pathogens like viruses and bacteria.
免疫学研究身体,采用何种机制来保护自身,免受外源病原体如病毒和细菌的伤害
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What are some of the differences between a bacterial cell and a human cell?
人类细胞和细菌细胞,有哪些不同之处呢
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Cells that I took from a human and cells that are in a bacterium.
人类细胞,和细菌细胞
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What are the differences between a bacterial cell and a human cell?
人类细胞和细菌细胞,有什么不同
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That's another difference between human cells and bacteria.
这是人类细胞和细菌的另一个不同
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We'll learn more about that in a moment, but basically it allows the immune system to distinguish between viral and bacterial pathogens, and respond appropriately depending on the type of pathogen that's there.
我们一会儿会学到不少,但基本上说,这样一来免疫系统,就能够分辨出病毒和细菌病原体,并对相应的病原体类型,产生合适的免疫反应
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Another thing that's different about human cells and animal - human cells and bacterial cells is that many bacterial cells can swim and can exist in suspension, that means just suspended in a fluid.
人类细胞和动物细胞--,和细菌细胞,另一个重要不同是,许多细菌细胞可以游动,可以生活在悬浮液中,就是说可以悬浮在液体中
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