名词
中文翻译：外层
同义词：
['outermost', 'outer covering']
例句：
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1.The outer layer of the skin is made up of keratin.
皮肤的外层由角质组成。
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2.The outer layer of the planet is composed mainly of rock.
行星的外层主要由岩石组成。
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3.The outer layer of the ocean is covered in seaweed.
海洋的外层覆盖着海藻。