钙

例句：

1. 1.Calcium is an essential mineral for bone health.
   钙是骨骼健康所必需的矿物质。
2. 2.The milk contains a lot of calcium for the baby's teeth development.
   牛奶中含有大量钙，对婴儿牙齿发育有益。
3. 3. Calcium supplements are often recommended for people with low calcium levels in their diet.
   钙补充剂通常推荐给那些饮食中钙含量低的人。