名词
中文翻译：底层覆盖物
同义词：
['underlay', 'underlayer例句：1. The undercoat of the fur is soft and warm.（毛皮的底层覆盖物柔软而温暖。）']
例句：
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1. The undercoat of the fur is soft and warm.
毛皮的底层覆盖物柔软而温暖。
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2. The undercoat is made from wool.
底层覆盖物是由羊毛制成的。
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3. The undercoat protects the fur against dirt and dust.
底层覆盖物保护毛皮免受灰尘和污垢的侵害。