名词
中文翻译：钙质外壳
同义词：
['limestone crust', 'calcite crust']
例句：
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1.The fossilized shell is a remnant of the ancient sea floor, preserved as a calcareous crust.
化石壳是古代海洋底部的遗迹，以石灰石外壳的形式保存下来。
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2.The formation of this layer is thought to be due to the deposition of calcium carbonate on the surface of the ocean floor.
这种层状的形成被认为是由于海洋底部表面沉积碳酸钙的结果。
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3. The study of these rocks helps us understand the geological processes that shaped our planet's crust.
研究这些岩石有助于我们理解塑造地球地壳的地质过程。