詞根 abl/abili act ann apt/ept arm art audi/audit ban bas bat bio ced/ceed/cess ceive/cept centr cid/cis circ/cycl cit civ claim/clam clin clud/clus/clos cogn/gno commun count cover cult cur dic/dict divid/divis dom du/duo/doub duc/duct fact/fect fenc/fend/fens fer form found/fund fus/fuse gen/gene/gener grad/ gress em-/en- ex- extra- fore- il-/ir- im- in- inter- intra-/intro-