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white noise

noun
🔊/ˌwaɪt ˈnɔɪz/
🔊/ˌwaɪt ˈnɔɪz/
 [uncountable] (physics物理)
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  1. noise that contains many different sound frequencies that are equally strong, for example the noise that comes from a television or radio that is turned on but not tuned in白噪声（整个频道范围内的噪声）Topics TV, radio and newsc2