名词中文翻译
中文翻译：外皮
同义词：
['outer layer', 'outer skin', 'outer covering']
例句：
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1. Theegg has a hard outer shell that protects the yolk and white.
这个蛋有一个硬的外壳，保护着蛋黄和蛋白。
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2. The scientist studied the outer layer of the skin to understand its function.
科学家研究皮肤的外层以了解其功能。
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3. The outer layer of the plant is made up of cells that are specialized for protection.
植物的外层由专门用于保护的细胞组成。