三氟化硼 sānfúhuàpéng boron trifluoride Origin Definitions Defs Strokes Stroke Words Sentences Sents 三 sān numeral three the number three; 3氟 fú noun fluorine (bound form) fluorine; the chemical element with atomic number 9, which is a highly reactive and toxic gas化 huà nounverb to change to change; to transform; to convert硼 péng boron boron; the chemical element with atomic number 5