名词
中文翻译：外皮
同义词：
['skin', 'outer layer', 'exterior']
例句：
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1.The outer skin of the fruit is very thin and easily peeled off.
这个水果的外皮很薄，很容易剥掉。
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2.The outer skin of the tree is tough and helps protect it from damage.
树的外皮很硬，有助于保护它免受损害。
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3.The outer skin of the animal is covered in hair to keep it warm.
动物的外皮覆盖着毛发，以保持温暖。