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The aerodynamical noise of vacuum couch roll is the major noise source of paper machine.
真空伏辊空气动力性噪声是造纸机的主噪声源。
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Noise from transportation is one major source of noise pollution.
交通噪音是噪音污染的主要来源。
youdao
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Noise from transportation is one major source of noise pollution.
交通噪音是噪音污染的主要来源。
youdao