1·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。
2·The fossils buried in Pleistocene and earlier ocean sediments were of foraminifera—small, single-celled marine organisms that secrete shells of calcium carbonate, or calcite.
在更新世和更早的海洋沉积物中埋藏的化石生物属于孔虫类生物，它们是微小的单细胞海洋生物，其分泌的硬壳由碳酸钙和方解石组成。
3·It has been known to us that the protein is conducive to the construction of the eggshell Calcium carbonate.
大家已经知道这个蛋白对蛋壳碳酸钙的形成有帮助。
4·The white cliffs of Dover, for example, are white because they contain limestone, or calcium carbonate.
比如，多佛的白色峭壁之所以为白色就是因为含有石灰岩或碳酸钙。
5·They hope to learn how quickly the carbon dioxide and water mixture reacts with the basalt rock to form calcium carbonate.
他们希望了解二氧化碳水溶液与玄武岩产生化学反应形成碳酸钙的速度有多快。