Usage priority
Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
费力的
先理解核心含义，再看它在真实句子里的用法。
费力的；努力的
characterized by effort to the point of exhaustion; especially physical effort
worked their arduous way up the mining valley
正在加载中文释义…
characterized by effort to the point of exhaustion; especially physical effort
正在加载中文释义…
taxing to the utmost; testing powers of endurance; ; ; - F.D.Roosevelt
正在加载中文释义…
difficult to accomplish; demanding considerable mental effort and skill
a grueling campaign
hard labor
heavy work
heavy going
spent many laborious hours on the project
set a punishing pace
his final, straining burst of speed
a strenuous task
your willingness after these six arduous days to remain here
the arduous work of preparing a dictionary
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Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from ECDICT, OCTANOVE.