Think about other people in your environment.
想想你生活中的人。
So being a micro-organism that got a plasmid that give you resistance to an antibiotic would be a good thing - that gave you resistance to something that naturally killed cells like you in your environment would be a good thing.
假如一个微生物,因含有质粒而具有抗生素抗性,这实在是一桩美事--,在同样的环境下,普通细胞会被杀死,而你们这些具有抗性的细胞却安然无恙,这实在太棒了
These are things that must be taken in from the environment because your body cannot manufacture them and they promote specific chemical reactions in the body.
这些都是必须从外界摄取的物质,因为无法通过自身合成,它们能促进体内特定的化学反应
The main function of all your cells, and all your tissues, and all your organs is to maintain this homeostasis, which allows you to live in a changing environment.
你所有细胞,所有的组织,所有的器官最主要的功能,就是维护这个内稳态,使你能够以不变应万变
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