To prevent your teeth from decaying, you can do two things - strengthen your teeth's defenses with fluoride and sealants, and reduce the number of bacteria in your mouth.
为了预防龋坏的发生，你可以做两件事情——用氟化物和封闭剂增强牙齿保护，减少口腔内细菌。
2
Fluoride enhanced the percentage of human embryo hepatocytes apoptosis bodies and increased the number of cell in s phase.
氟可使人胎肝细胞凋亡百分率明显升高，S期细胞数增多。
3
Usually fluorinated copolymer unit, said the number of fluorine atoms, such as fluorine rubber, 23, is a vinylidene fluoride copolymers with chlorotrifluoroethylene.