caliduct

例句：

1. 1. The bones need calcium to stay strong.
   骨骼需要钙来保持强壮。
2. 2. Calcium supplements are recommended for people who are not getting enough of it in their diets.
   建议那些饮食中钙摄入不足的人补充钙质。
3. 3.The milk contains a lot of calcium, which is good for your bones.
   牛奶含有很多钙，对骨骼有益。