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汤池铁城
Pinyin:
tāng shi tiě chéng
Explanation:
形容城池牢不可破。亦比喻言谈无懈可击。
Source:
南朝·宋·刘义庆《世说新语·文学》殷中军虽思虑通长,然于才性偏精,忽言及四本,便若
汤池铁城
,无可攻之势。”