The sound is of a motorcycle engine that is first on idle and then is revved as well as gradually revved up to indicate speed. 摩托車閒置和加速 聲道：2 類型：wav motor、motorcycle、bike、revving、idle、rev、OWI、idling、engine 發動機、摩托車、自行車、上竄、閒、轉、OWI、空轉、發動機 資料來源：freesound ( https://freesound.org )
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