名词
中文翻译：粗皮
同义词：
["外皮，外壳例句：1. The tree's outer layer is covered in a thick", "rough bark.（这棵树的外层覆盖着厚厚的粗糙树皮。）2. The animal's crural sheath protects its vulnerable parts.（动物的外层皮保护着它的脆弱部分。）"]
例句：
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1. The tree's outer layer is covered in a thick, rough bark.
这棵树的外层覆盖着厚厚的粗糙树皮。
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2. The animal's crural sheath protects its vulnerable parts.
动物的外层皮保护着它的脆弱部分。
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3.The scientist removed the crural sheath to examine the inner workings of the machine.
科学家移除了外层皮以检查机器的内部工作原理。