To rack one's brains and exert extreme mental effort; to painstakingly devote oneself to a task, especially creative or intellectual work, putting one's heart and soul into it.
为了完成这部小说，他鉥心刿目，废寝忘食，终于写出了震撼人心的作品。
To complete this novel, he racked his brains and worked day and night, finally producing a moving and impactful work.
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