名词
中文翻译：Unknown
同义词：
['outer', 'outermost', 'surface例句：1. The outer layer of the skin is very thin and can easily be damaged.（皮肤的外层非常薄，容易受损。）']
例句：
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1. The outer layer of the skin is very thin and can easily be damaged.
皮肤的外层非常薄，容易受损。
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2. The outermost layer of the planet is made up of rock.
行星的最外层由岩石组成。
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3.The surface of the lake is covered in a thick layer of ice.
湖面覆盖着厚厚的一层冰。