词根词缀：class-

【来源及含义】Latin: division according to rank; class, division, army, fleet

【同源单词】aclassis, class, classic, classical, classical archaeology, classical education

词根词缀：-less

【来源及含义】Old English: -leas, from leas, "free from, devoid of, false, feigned"; suffix meaning "lacking"

【同源单词】aimless, artless, avoidless, causeless, ceaseless, charmless