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1. Oxford Dictionary

   plasma membrane

   • n.
     a microscopic membrane of lipids and proteins which forms the external boundary of the cytoplasm of a cell or encloses a vacuole, and regulates the passage of molecules in and out of the cytoplasm.

   • noun: plasma membrane, plural noun: plasma membranes

2. • 更多解釋

   plasma membrane

   • IPA[ˈplazmə ˈmemˌbrān]

   • n.
     a microscopic membrane of lipids and proteins which forms the external boundary of the ...

   Oxford American Dictionary