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。
In many marine creatures, however, the skeleton is composed of a mineral variety of calcium carbonate called aragonite.
珊瑚虫也将如此，特别是那些骨架由霰石(一种极不稳定的碳酸钙形式)组成的种类。
So will corals, especially those whose skeletons are composed of aragonite, a particularly unstable form of calcium carbonate.
另外，实验还显示，碳酸钙眼睛允许石鳖在水中和空气中达到相同的视力，这可能有助于它们适应潮汐变化。
For another thing, the experiments suggest aragonite allows the chitons to see equally well in air or underwater, something that's probably useful as tides ebb around the mollusks.
例如，构成眼睛的硬质碳酸钙适应力极强，这对于石鳖来说很重要，因为它们要在自然栖息地——浅潮水坑中不断遭受海浪的冲击。
For one thing, the hard aragonite is extremely resilient, an important trait for chitons, which are constantly being pummeled by waves in their natural habitats, shallow tidal pools.
寺后有一石峰，除碑檐外，几乎被碳酸钙沉积淹没，碑文已不可 辨认。
All but the top of the tablet has been eroded by calcium carbonate, and the inscriptions have become unreadable.
雨水渗过地面和贝壳，溶解碳酸钙并把其带到叠层石上。
Rain water is leaching through the ground and the shells, dissolving out calcium carbonate and carrying to the stromatolites.
钙以方解石（碳酸钙）的形式存在于石灰岩、白垩、大理石、白云石、蛋壳、珍珠、珊瑚、钟乳石、石笋和许多海洋动物的壳体中。
In its compounds calcium has valence 2. It occurs in limestone, chalk, marble, dolomite, eggshells, pearls, coral, and many marine shells as calcium carbonate, or calcite;
人造大理石，主要原材料是天然大理石的边角料，碳酸钙粉，树脂；
The raw material of artificial marble includes natural marble powder and resin;
人造大理石，主要原材料是天然大理石的边角料，碳酸钙粉，树脂；
The raw material of artificial marble includes natural marble powder and resin;
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