碘元素

例句：

1. 1. Iodine is an essential trace element for human health.
   碘是人体健康所必需的微量元素。
2. 2. The process of iodizing salt involves adding iodine to it.
   碘化盐的过程是将碘添加到食盐中。
3. 3. In some countries, iodized salt is a required ingredient in many foods.
   在一些国家，碘盐是许多食物的必需成分。