形容词<古>费力的，困难的，辛勤的
1. 费力的：opern 歌剧 | operose 费力的 | ophicleide 金管乐器
2. 用功的：operon 相似的一群遗传因子 | operose 用功的 | operosepainstaking 勤勉的
3. 费力的,用功的：golbose 球形的 | operose 费力的,用功的 | verbose 冗长的
4. 费力的/吃力的/勤勉的/用功的：operon /相似的一群遗传因子/ | operose /费力的/吃力的/勤勉的/用功的/ | ophiasis /匐行性脱发/
adj
1. characterized by effort to the point of exhaustion
especially physical effort
e.g. worked their arduous way up the mining valley
a grueling campaign
hard labor
heavy work
heavy going
spent many laborious hours on the project
set a punishing pace
Synonym: arduous backbreaking grueling gruelling hard heavy laborious punishing toilsome