词根词缀：echo-, ech-

【来源及含义】Greek: sound, noise; especially a returned sound; repetition, imitation

【同源单词】anecho, anechoic, catecheses, catechesis, catechetical, catechism

词根词缀：praxis-, -praxsis, -praxia, -praxic, -praxi-

【来源及含义】Greek > Latin: to do, to exercise, doing; action, activity, practice; the opposite of theory; from the stem of prassein, "to do, to act"

【同源单词】actinopraxis, agnostic apraxia, akinetic apraxia, amnesic apraxia, aphagopraxia, apraxia