名词
中文翻译：外层
同义词：
['exoskeleton', 'cuticle', 'epidermis']
例句：
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1.The ooecium of the butterfly's wings is a fascinating structure.
蝴蝶翅膀的外层结构令人着迷。
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2.The ooecium of the snake skin provides excellent protection against predators.
蛇皮的外层提供了极好的保护，免受捕食者的伤害。
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3.The ooecium of the tree bark is rich in nutrients that nourish the tree.
树皮的外层富含养分，滋养着树木。