名词
中文翻译：珍珠母
同义词：
['pearl mother', 'pearl layer']
例句：
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1.The oyster's shell is made up of several layers, including the calcified pearl mother.
牡蛎的壳由多层组成，包括钙化的珍珠母。
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2.The ancient Egyptians used to make jewelry from the inner layer of the pearl mother.
古埃及人过去常从珍珠母的内部制作珠宝。
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3. The oyster's shell is a fascinating example of how nature can create complex structures out of simple materials.
牡蛎壳是自然界如何用简单的材料创造出复杂结构的一个引人入胜的例子。