The hum of an operational soda machine located in a bowling alley. (If you listen very closely, you can hear pins being knocked down in the distance.) Recorded via a Zoom H4N. 汽水機噪音 聲道：2 類型：wav soda、noise、hum、machine 蘇打、噪聲、哼、機 資料來源：freesound ( https://freesound.org )
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