名词
中文翻译：Unknown
同义词：
['bong', 'thud', 'bump', 'knock']
例句：
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1. The car's engine was making a thudding sound as it accelerated.
汽车加速时发动机发出了咚咚声。
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2. The heavy bag landed with a thud on the floor.
沉重的沙袋重重地落在地板上。
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3. He knocked the door hard with his shoulder and heard a thud.
他用肩膀猛击门，听到了一声沉闷的撞击声。