短語詞組短語decrease day by day 每天減少;減少一天一天decrease e by 減少了;縯繹decrease e by degress 依次減少decrease Arsenic by oxidation 氧化降砷decrease step by step 逐步減小decrease -by-distance 遞遠遞減運價gradually decrease year by year 逐年遞減decrease by degrees 遞減decrease by degress 依次減少 返回 decrease by