Calcium is a kind of mineral. 钙是一种矿物.

　　It is found in rocks, sea water and soil. 它常见于岩石、海水和土壤中。

　　Calcium is important for human health. 钙对人体健康很重要。

　　Then do we have to eat rocks or soil to consume Calcium? 那么，我们必须吃石头或土壤来消耗钙吗？

　　Of course not. Calcium is also found in many kinds of food. 当然不是。许多种类的食物中也含有钙。

　　Usually, dairy products like milk, cheese and yogurt have a lot of Calcium. 通常，牛奶、奶酪和酸奶等乳制品含有大量的钙。

　　Orange juice and soy milk are also great sources. 橙汁和豆奶也是很好的来源。

　　Then why is Calcium important for human health? 那么为什么钙对人体健康如此重要呢？

　　People especially children need to eat a certain amount of Calcium every day, because our bones need Calcium. 人们特别是儿童需要每天摄入一定量的钙，因为我们的骨头需要它。

　　Without Calcium, bones don't grow properly. 没有钙，骨骼不能正常生长。