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鑽故紙堆

zuāngùzhǐduī

ㄗㄨㄢ ㄍㄨˋ ㄓˇ ㄉㄨㄟ

Simplified 钻故纸堆

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  1. 1to dig into piles of outdated writings (idiom); to study old books and papers

Keep 鑽故紙堆 and it comes back until you know it.

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