Spaceship hover engine rumble/drone thingy. I can't honestly think of a better description of it. Could also perhaps be used for, say, some sort of alien machinery running or something. It's up to you how to use it. :)
Made entirely in Audacity. 懸停宇宙飛船/科幻發電機機械無人機 聲道：2 類型：wav machine、space、generator、sci-fi、spaceship、drone、engine 機、空間、發電機、科幻、飛船、無人駕駛飛機、發動機 資料來源：freesound ( https://freesound.org )
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