It means that if I have a biological cell, or some container with a membrane through which one of the constituents might pass.
它的意思是如果我有一个生物细胞，或带膜的容器，其中一种组分可以通过这层膜。
Straightly Stand on Wooden Pallet and Wrapped with Fibre Borad, Plastic Membrane &Kraft Paper Board Bound with iron Belts Externally and Then Mounted in the Container with Iron Belt.
木托架包装，用纤维板、塑料薄膜及瓦愣纸皮包裹，外用铁带捆扎，再用铁带固定于集装箱内来源考试大。
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