名词
中文翻译：外层
同义词：
['outermost', 'outermost layer']
例句：
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1.The outer layers of the skin are responsible for protecting it from the elements.
皮肤的外层负责保护它免受外界环境的影响。
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2.The outer layers of the ocean are often covered in seaweed.
海洋的外层经常被海藻覆盖。
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3. The outer layers of the plant are where most of its nutrients are stored.
植物的外层是储存大部分营养的地方。