In many marine creatures, however, the skeleton is composed of a mineral variety of calcium carbonate called aragonite.

然而，很多海洋生物的骨骼由一种叫作霰石的碳酸钙矿物变体组成。

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X-ray examination of thin slabs of rock sometimes reveals the ghostly outlines of tentacles, digestive tracts, and visual organs of a variety of marine creatures.

对岩石薄片的 X 射线检查有时会发现可怕的触角轮廓、消化道和很多种海洋生物的视觉器官。

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That is bad because many Marine creatures rely on shells made of calcium carbonate to protect themselves.

这是相当糟糕的，因为很多海洋生物生活在钙质碳酸盐的贝壳里以保护自己。

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That is bad because many marine creatures rely on shells made of calcium carbonate to protect themselves.

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