A thin sheet of natural or synthetic material that is permeable to substances in solution.
A thin sheet of natural or synthetic material that is permeable to substances in solution.
膜由天然的或合成的材料制成的薄片，可允许溶液中之溶质通过
A thin sheet of natural or synthetic material that is permeable to substances in solution.
膜由天然的或合成的材料制成的薄片，可允许溶液中之溶质通过