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From 《汉书·楚元王传》 (Book of Han, Biography of Liu Xiang). Liu Xiang criticized scholars who were 深闭固距 - sealed deep and firmly refusing - to even test classical texts they hadn't memorized, blocking the spread of learning.
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Literary, formal. Common in essays and editorials about people who refuse to engage with ideas, criticism, or change. Not used in casual speech.
