名词
中文翻译：Unknown
同义词：
['exoskeleton', 'epidermis', 'dermis', 'cuticle']
例句：
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1. The periplast is a vital component of the human body's defense system.
外骨骼是人体防御系统的重要组成部分。
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2. The skin is made up of several layers, including the epidermis and dermis.
皮肤由几层组成，包括表皮和真皮。
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3. The outer layer of the plant is called the cuticle.
植物的外层被称为角质层。