With the constant increase of the trains' speed, the aerodynamic noise gradually succeeds the traditional track noise and becomes the main noise source of the high-speed trains.

随列车行驶速度逐年提高，气动噪声源逐渐超越轮轨噪声成为高速列车最主要噪声源。

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And watched three-spined stickleback fish hunt water fleas, to the accompaniment of either white noise calibrated to match the noise level of speedboats or a silent track as a control.

并控制三刺鱼在跟快艇噪音程度相当的白噪声中，或者完全安静的环境之下，观察它们捕食水蚤的情况。

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Stackingimproved the signal-to-noise ratio and enabled the researchers to moreclearly track the path and behaviour of each unique signal as it passedthrough the lunar interior.

叠加提高了信号的信噪比，使研究人员能够更清楚地跟踪每一个独特的信号在月球内部传播的路径和行为。

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It was a damp day and, after he had parked the van and set off down the forest track, even the noise of the Edinburgh-Glasgow motorway was muffled by thick, dark fir trees.

ECONOMIST: Robert Taylor

The noise from an on-site generator meant the track gang had no warning about the trailer's approach.

BBC: NEWS | UK | England | Pair jailed for Tebay rail deaths

"Over a longer periods these things do track, but month-to-month there's a lot of noise, " Wyss said.

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