词根词缀:retro-, retr-
【来源及含义】Latin: back, backward, backwards; behind
【同源单词】arrear, regurgitant menstruation, retroact, retroaction, retroactive, retroactively
【来源及含义】Latin: back, backward, backwards; behind
【同源单词】arrear, regurgitant menstruation, retroact, retroaction, retroactive, retroactively