operose英美adj. 刻苦的；费力的；困难的英英释义adjcharacterized by effort to the point of exhaustionworked their arduous way up the mining valleya grueling campaignhard laborheavy workheavy goingspent many laborious hours on the projectset a punishing paceSynonym:arduousbackbreakinggruelinggruellinghardheavylaboriouspunishingtoilsome
