calcium
US /ˈkæl.si.əm/
UK /ˈkæl.si.əm/
1.
鈣
the chemical element of atomic number 20, a soft silvery-white reactive metal occurring in limestone, marble, and gypsum. It is an essential constituent of bone, teeth, and shells and is a vital dietary constituent.
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Milk is a good source of calcium.
牛奶是鈣的良好來源。
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Our bones need enough calcium to stay strong.
我們的骨骼需要足夠的鈣才能保持強壯。