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A long time ago, there was a frog living in a deserted well. It had never jumped out of the well, and with plenty to eat and drink, it felt quite content.
One day, it curiously asked a passing sea turtle how vast the sky was. The sea turtle described how incredibly vast the sky was, but the frog couldn't comprehend what the sea turtle was explaining.
It firmly believed that the sky was only as big as the well's opening and that the sea turtle was just joking with it.

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Open the tool →坎井之蛙 (kǎn jǐng zhī wā) is a Chinese idiom (chengyu) meaning “a person with a very limited outlook or experience”.
坎井之蛙 is pronounced kǎn jǐng zhī wā in Mandarin Chinese.
Literally, 坎井之蛙 means “a frog in a collapsed well”. It is used to mean “a person with a very limited outlook or experience”.
坎井之蛙 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
坎井:坏井,废井。废井里的青蛙。比喻见识不多的人。