Sounds clear, but there is slight machine noise.

音质清晰，但稍有轻微机械噪音。

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The extraction and application of principle component representations were studied for machine noise monitoring.

研究了设备噪声监测中主分量特征表示的提取及应用。

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For example, in production workshop, the workers hope there is something that can reduce machine noise, but can communicate easily.

在大多数情况下，用户希望有选择性地降噪。比如说在生产车间，工人希望既能降低机器轰鸣声，同时又能轻松地交流。

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But on Monday, the white noise machine was activated without the prior knowledge of the judge or the courtroom security officer.

BBC: Guantanamo trials: Judge orders end to secret censor

Using eyeshades or room darkening curtains or blinds and a white noise machine may help you sleep better when you want to.

CNN: Can melatonin prevent jet lag?

Spectators watch the proceedings behind soundproof glass, and receive audio on a 40-second delay so that a court security officer can switch on a white noise machine while classified information is being discussed.

BBC: Guantanamo trials: Judge orders end to secret censor