词根：-grad-, -gress-

【词根含义】：步,级

【词根来源】：来源于拉丁语名词gradus(步)和拉丁语动词gradior, gradi, gressus, sum(步行)。

【同源单词】：centigrade, degrade, downgrade, gradation, grade

前缀：pro-

【词根含义】：前;公开

【词根来源】：来源于希腊语和拉丁语pro。

【同源单词】：by-product, compromise, improvident, microprocessor, portrait

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：pro-, por-, pur-

【来源及含义】Greek > Latin: a prefix signifying before; forward, forth; for, in favor of; in front of; in place of, on behalf of; according to; as, to place before; to go before or forward, to throw forward

【相关词根词缀】 Related before-word units: ante-; antero-; anti-; pre-.

【同源单词】portend, portent, portentous, portentously, portentousness, pro