Loop of some sort of engine or fridge running. (It's actually the sound of the microwave oven in my kitchen running.) Recorded with a 5th-gen iPod touch. Edited with Audacity. 引擎運行Loop.wav 聲道：2 類型：wav mechanical、loop、machine、engine 機械、循環、機、發動機 資料來源：freesound ( https://freesound.org )
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