To exert great effort with little or no success; to engage in a laborious but fruitless endeavor.
他花费了大量时间去研究一个已经被解决的问题，最终发现自己的努力是抱瓮出灌。
He spent a great deal of time researching a problem that had already been solved, only to find his efforts were like carrying a jar to irrigate (much effort for little gain).
Era:
Ancient
Frequency:
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