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The very top of the wire drawing represents the only part of the ocean landscape that can be seen on the surface of the water: It is Bouvet Island, one of the most isolated islands in the world.
VOA: special.2009.05.06
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They might ingest extracellular antigen, presented pieces of it on their cell surface in the context of MHC-2.
它们可以吞噬胞外抗原,根据细胞表面的,主要组织相容性抗原-2
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So, it doesn't need to bind to a receptor on the surface of the cell in order to work because the molecule can actually enter the cell directly.
所以无需与细胞表面受体相结合来起效,因为这些分子能直接进入细胞
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The land surface pokes just a couple of meters on average above sea level, making it the lowest-lying nation in the world.
VOA: standard.2009.10.17
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That was the eventual message that I got, but it was sort of, it was not on the surface, it was not obvious, because the story, the two movies were sort of sad... ? Anybody want to say something about it?
这就是我得到的最本质的信息，但因为这两部电影都有些伤感，以致这些信息都是隐晦的，不是一眼能看出来的。,还有人想对此说些什么吗？
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It turns out the electrical potential or electricity that you can measure on the surface of the body reflects things that are happening deeper inside like the beating of your heart.
人们已经证明在体表测量得到的电势能,或者电信号,能够表征,像心跳这样,身体较深处的变化
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That infection occurs because of a ligand receptor interaction on the cell surface where the virus itself is the ligand and it takes advantage of a receptor that's expressed on the cell surface.
感染的发生是由于,配体与细胞表面受体相互作用,病毒是配体,它利用了在,细胞表面表达的受体
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They also allow their populations of proteins on the surface of each cell that allow it to interact with its environment, they're receptors and cell adhesion receptors like I talked about last time.
它们同时也使得,这些细胞表面的蛋白质群,使得细胞能够和周围环境进行互动,它们是受体和细胞粘附受体,我上次也说过的
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Well, the way that your immune system recognizes it is that all the cells of our body express a molecule on their surface, a membrane protein called the MHC1 complex.
而免疫系统识别的方法是,身体内所有细胞在其表面表达一种分子,一种叫做MHC1复合体的膜蛋白
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