formula

n.公式；配方，外方；规则，一定的做法

formal, formaldehyde, formalin, formalism, formality, formalization, formalisation, formalize, formalise, formally, format, formation, formative, formed, former, formerly, formic acid, Formica, formidable, formidably, formless, formlessly, formulaic, formulate, formulation, fornicate, fornication, forsake, forsaken, forseeable, forswear, forsythia, fort, forte, forth, forthcoming, forthright, forthwith, fortieth, fortification, fortified wine, fortify,