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：muni-, muner-, mun-

【来源及含义】Latin: service, performing services; duty, receiver of duties; office, function; gift

【同源单词】autoimmune, immune, immunity, immunization, immunize, municipal