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专精覃思
Pinyin:
zhuān jīng tán sī
Explanation:
覃深入地。精心专研,深入思考。
Source:
《三辅黄图·阁》刘向于成帝之末,校书天禄阁,
专精覃思
。”《北齐书·冯伟传》后还乡里,闭门不出将三十年,不问生产,不交宾客,
专精覃思
,无所不通。”