classification

n.分类，分级

clarinet, clarinettist (also clarinetist), clarion, clarity, clash, clasp, clasp-knife, class, class-conscious, class-consciousness, class-feeling, class-list, class-mate, class-room, classic, classical, classically, classicism, classicist, classifiable, classified, classify, classify...as, classless, classmate, classroom, classy, clatter, Claudius Ptolemaeus, clause, claustrophobia, claustrophobic, clavichord, clavicle, claw, claw-back, claw-hammer, clay, clay pigeon, clay pipe,