词根词缀：gymno-, gymn-

【来源及含义】Greek: unclothed, bare, unclad, disrobed, undressed; naked, nude

【相关词根词缀】 A related "unclothed; uncovered" word family: nudo-, nudi-.

【同源单词】gymnanthous, gymnasiarch, gymnasiast, gymnasium, gymnast, gymnastic

词根词缀：-ics, -tics [-ac after i]

【来源及含义】Greek: a suffix that forms nouns and is usually used to form names of arts and sciences

【同源单词】acoustics, acoustoelectronics, acousto-optic, actinogenics, actinotherapeutics, actinotherapy

词根词缀：mechano-, mechan-; mechanico-; machin-

【来源及含义】Greek makhana, machana > Latin machina: machine, device, tool; an apparatus for applying mechanical power to do work; mekhanikos > machynen, decide a course of action, contrive, plot contrivance; a machine or the workings of machines

【同源单词】aeromechanics, agricultural mechanics, backyard mechanic, biomechanical, biomechanics, dentomechanical