深思；沉思
先理解核心含义，再看它在真实句子里的用法。
深思；沉思；深思；沉思
prolonged and serious thinking or reflection
She sat in deep thought, trying to solve the puzzle.
她陷入沉思,试图解决这个谜题。
深思；沉思
prolonged and serious thinking or reflection
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Dictionary facts from AI_SUPPLEMENT.