词根词缀：grad-, -grade, -gred, -gree, -gress

【来源及含义】Latin: walk, step, take steps, move around; walking or stepping

【同源单词】ad eundem gradum, aggradation, aggression, aggressive, aggressively, aggressiveness

词根词缀：gurgit-, gurg-

【来源及含义】Latin: gurgitare, "to flood"; gurges, gurgitis, "the gullet, a gulf, the sea"; to surge, to flood; pour, glut, gorge; whirlpool, engulf; boiling liquid

【同源单词】aortic regurgitation, cardiac regurgitation, disapproving regurgitation, duodenal regurgitation, gurging, gurgitate

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