calcium
US /ˈkæl.si.əm/
UK /ˈkæl.si.əm/
1.
钙
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.
:
•
Milk is a good source of calcium.
牛奶是钙的良好来源。
•
Our bones need enough calcium to stay strong.
我们的骨骼需要足够的钙才能保持强壮。