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：theor-

【来源及含义】Greek (theorein, theoria); Latin (theoria): looking at, contemplation, spectator, speculation; viewing

【同源单词】theorem, theoretical, theoretician, theoretics, theorize, theory