英语语法分析

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。

Bats, swallows and more are chemically preserved in the pose in which they perished, sealed in the deposits of sodium carbonate in the water.

蝙蝠、燕子以及更多的动物遗体以化学方式保存成它们死亡时的姿势，被密封在水里的碳酸钠沉 积物中。

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。