This idiom emphasizes that to maintain and improve a skill, one must practice diligently and continuously, just as a boxer's fist always stays ready and a singer's voice is always in use.
学乐器也是一样，要想弹奏得好，就得拳不离手，曲不离口，每天坚持练习。
Learning a musical instrument is the same; to play it well, you must practice diligently every day, like a boxer constantly training and a singer constantly singing.
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