名词
中文翻译：外膜
同义词：
['outer layer', 'outer membrane', 'outermost layer例句：1. The outer layer of the skin is responsible for protecting it from external factors.（皮肤的外层负责保护它免受外部因素的影响。）2. The outer layer of the eggshell is made up of calcium carbonate.（蛋壳的外层由碳酸钙组成。）']
例句：
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1. The outer layer of the skin is responsible for protecting it from external factors.
皮肤的外层负责保护它免受外部因素的影响。
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2. The outer layer of the eggshell is made up of calcium carbonate.
蛋壳的外层由碳酸钙组成。
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3.The outer layer of the plant is where photosynthesis occurs.
植物的外层是光合作用发生的地方。