氟 fú fluorine Definitions Defs Origin Strokes Stroke Words Sentences Sents 1 sentence 牙膏里通常含有氟,可以预防龋齿。 yágāo lǐ tōngcháng hányǒu fú, kěyǐ yùfáng qǔchǐ. Toothpaste usually contains fluoride to prevent cavities. Source: Dong Chinese Dictionary