名詞 calcium:

1. a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals
   同義詞：Ca, atomic number 20

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(dòng)物的貝殼中，圍繞著一粒沙子或其他外來(lái)物質(zhì)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
2. I have a slight calcium deficiency.
   我有點(diǎn)缺鈣。
3. Calcium is beneficial to our bones.
   鈣對(duì)我們的骨骼有益。
4. We need some calcium everyday.
   我們每天需要些鈣。

cal.ci.um

n.Symbol Ca （名詞）符號(hào) Ca
A silvery, moderately hard metallic element that constitutes approximately 3 percent of the earth`s crust and is a basic component of most animals and plants. It occurs naturally in limestone, gypsum, and fluorite, and its compounds are used to make plaster, quicklime, Portland cement, and metallurgic and electronic materials. Atomic number 20; atomic weight 40.08; melting point 842 to 848=C; boiling point ,487=C; specific gravity .55; valence 2.See table at element
鈣：一種銀色的、硬度適中的金屬元素，約占地殼中各種元素的百分之三，是多數(shù)動(dòng)物和植物的基本組成物之一。自然存在于石灰石、石膏、氟石以及其它化合物之中，用于制造石膏、生石灰、硅酸鹽水泥以及冶金和電子材料。原子序數(shù)20；原子量40.08；熔點(diǎn)842到848度；沸點(diǎn),487度；比重.55；化學(xué)價(jià)2參見(jiàn) element

來(lái)源：
Latin calx calc- [lime] * see calx
拉丁語(yǔ) calx calc- [石灰] *參見(jiàn) calx
-ium
-ium