名词
中文翻译：膜囊
同义词：
['membrane sac', 'membranous sac']
例句：
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1.The cell membrane is a thin layer that separates the inside of the cell from the outside environment.
细胞膜是一层薄薄的膜，将细胞内部与外部环境分隔开。
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2.The membranous sac surrounding the egg provides protection and nutrients for the developing embryo.
围绕蛋的膜囊为胚胎的发育提供了保护和营养。
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3.The membranous sac can be seen as a protective barrier between the two cells.
膜囊可以看作是两个细胞之间的保护屏障。