名词
中文翻译：内壳
同义词：
['inner shell', 'inner covering']
例句：
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1.The oyster's inner shell is a protective layer that keeps it from being damaged by predators.
牡蛎的内壳是一层保护层，可以防止它被捕食者破坏。
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2. The scientist discovered the inner shell of the mollusk and found it to be made of calcium carbonate.
科学家发现了这个软体动物的内壳，发现它是碳酸钙制成的。
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3. The inner shell of the seashell was so thin that it could easily be broken.
海贝壳的内壳非常薄，很容易就被打破了。