In fact, the water quality near Sihong County is not good, which is called hard water. Just look at the kettle at home. Too many ditches lead to high fluorine content. Looking around, Sihong people's teeth are not good-looking, which has a lot to do with the water quality, so they can't see where they are dizzy, but if the county is in half a city, they are really dizzy. Who is better in half a city? Look at people's teeth there.