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。
奋发的
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奋发的；费劲的
characterized by or performed with much energy or force
strenuous exercise
正在加载中文释义…
characterized by or performed with much energy or force
正在加载中文释义…
taxing to the utmost; testing powers of endurance; ; ; - F.D.Roosevelt
his final, straining burst of speed
a strenuous task
your willingness after these six arduous days to remain here
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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.