This is the first seasonal phrase for the month of May. The sentence is: Frogs begin croaking in plow-land, which imply summer season begins and farm activities also start in earnest.
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5月最初の七十二候の名称です。田畑で蛙が鳴き始める。つまり、夏が始まり、農作業も本格的に始まるということでしょうか。
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