To rack one's brains in profound thought for literary composition; to ponder deeply over literary ideas.
为了让剧本的对话更具深度，他闭门苦读，搜索肾胃，反复推敲每一个字句。
To give the script's dialogue more depth, he immersed himself in reading, racking his brains, and meticulously refining every word and phrase.
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