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。

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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。

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Usually fluorinated copolymer unit, said the number of fluorine atoms, such as fluorine rubber, 23, is a vinylidene fluoride copolymers with chlorotrifluoroethylene.

通常以共聚物中含氟单元的氟原子数目来表示，如氟橡胶23，是偏二氟乙烯同三氟氯乙烯的共聚物。

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