fluorine iodine

例句：

1. 1. This chemical is used in the production of fluorescent lights.
   这种化学物质用于生产荧光灯。
2. 2. The fluorine content in this mineral is high.
   这种矿物中的氟含量很高。
3. 3. Fluorine is essential for human health.
   氟对人的健康至关重要。
4. 1. Iodine is a key element in the human diet.
   碘是人体饮食中的关键元素。
5. 2. The iodine deficiency in this region has been a concern for many years.
   该地区的碘缺乏问题已经困扰了多年。
6. 3. Iodine is used to treat goiter and thyroid disorders.
   碘用于治疗甲状腺肿大和甲状腺疾病。