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因(yīn )地(dì )陷(xiàn )而(ér )天(tiān )然(rán )形(xíng )成(chéng )之(zhī )井(jǐng )。

明(míng )杨(yáng )慎(shèn )《丹(dān )铅(qiān )总(zǒng )录(lù )·地(dì )理(lǐ )·穴(xué )井(jǐng )》：“先(xiān )天(tiān )上(shàng )古(gǔ )穴(xué )井(jǐng )，后(hòu )天(tiān )中(zhōng )古(gǔ )凿(záo )井(jǐng )也(yě )。”

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●穴井（简体版）