звук ручья【癒し系】自然音 せせらぎ ソフト水流音３時間
リラックスしながら超集中する脳波（mid-α波）になりやすいタイプの音源を作業用として延長しました。教育...
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![[The Best Relaxing sounds] River and Bird song in Nature Vol, 3](https://sun9-12.userapi.com/sEZnPOULpeHoowRIzdJUreMbNYvo8U3gpaesNg/h63xHg4KSnA.jpg)
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