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TOEFL BNC: 4883 COCA: 7078
membranenoun [ C or U ]usuk/ˈmem.breɪn/ specialized

anatomy a thin piece of skin that covers or connects parts of a person's or animal's body

The cornea is the transparent membrane that covers the front of the eye.角膜是覆盖在眼球前部的透明膜。

engineering a very thin piece of material that covers an opening薄膜;膜状物

biology the outer covering of a cell细胞膜

a cell membrane细胞膜

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