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Aren't all membranes semi-permeable? That is, the whole point of a membrane is that it lets some things through and others not. Membranes by definition are permselective or semi-permeable barriers.

也就说他认为所有,从定义来看就选择过或者结构。

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gelatinous, gelatinoussubstance, gelatinoustissue, gelatinum, gelation, gelato, gelatose, gelatum, geld, gelder,

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3G, 401(K), a,

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