名词
中文翻译：蛋白质外层
同义词：
['envelope of protein', 'outerlayer of protein']
例句：
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1.The cell membrane is the protein envelope thatseparates the inside from the outside ofthe cell.
细胞膜是分隔细胞内部和外部的蛋白质外层。
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2. The outer layerof the skin is made up of aprotein envelope that protects it from theenvironment.
皮肤的外层由一种蛋白质外层组成，保护它免受环境影响。
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3.The virus has a protein envelope that caninfect other cells.
该病毒有一个蛋白质外层，可以感染其他细胞。