calcium carbonate

漢語翻譯

英文解釋：

名詞 calcium carbonate:

1. a salt found in nature as chalk or calcite or aragonite or limestone

例句：

1. A smooth, lustrous, variously colored deposit, chiefly calcium carbonate, formed around a grain of sand or other foreign matter in the shells of certain mollusks and valued as a gem.
   珍珠在幾種軟體動物的貝殼中，圍繞著一粒沙子或其他外來物質形成的一種光滑、有色澤、具有不同顏色且主要是碳酸鈣的沉積物，被珍視為寶石