词根词缀：fac-, facil-, fact-, feas-, -feat, -fect, -feit, -facient, -faction, -fic-, -fy, -ficate, -fication

【来源及含义】Latin: to make, to do, to build, to cause, to produce; forming, shaping

【同源单词】Ab officio et beneficio, abortifacient, absorbefacient, absorbifacient, acoustoelectric effect, affair

词根词缀：stulti-, stult-

【来源及含义】Latin: foolish, foolishness, folly, silliness

【同源单词】Infinitus est numerus stultorum, Nisi utile est quod facimus stulta est gloriae, Nomina stultorum parietibus haerent, stultification, stultified, stultifier