High-frequency squeak, hum:
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The noise of the room, electrical appliance
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Throw nutshells on the floor
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Throw a backpack on the floor
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Airport Luggage Transport Belt
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Time Machine
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Pounding in the mud
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Chemistry, burner, boiling liquid
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The noise of the refrigerator room
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Chemistry, Bunsen Burner
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Wooden whistle
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Wheeled Supermarket Cart
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Chewbacca’s voice
★★★★★