名词
中文翻译：外皮
同义词：
['outer skin', 'outer layer']
例句：
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1.The scientist carefully removed the exocarp of the fruit to examine its innerstructure.
科学家小心翼翼地剥去果实的外皮，以检查其内部结构。
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2. The plant's exocarp is madeup of tough, waterproof cells.
这种植物的外皮由坚韧、防水的细胞组成。
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3. The exocarp of thetree provides protection from the elements and helpsto keep the tree healthy.
树的外皮提供了对环境的保护，有助于保持树木的健康。