formal

a.正式的，规格化的，礼仪上的

forget-me-not, forgetful, forgetfully, forgetfulness, forging, forgivable, forgive, forgive sb. for sth., forgiveness, forgiving, forgivingly, forgo, forgot, forgotten, fork, forlorn, forlornly, forlornness, form, form-blaind, formaldehyde, formalin, formalism, formality, formalization, formalisation, formalize, formalise, formally, format, formation, formative, formed, former, formerly, formic acid, Formica, formidable, formidably, formless, formlessly, formula,