To rack one's brains; to apply oneself assiduously and painstakingly; to exert utmost mental effort in a task or creative endeavor.
这位作家为了完成新作品，每日每夜鉥心刿肾，字斟句酌，力求完美。
To complete his new work, the writer painstakingly racked his brains day and night, weighing every word and striving for perfection.
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