Time delay method was used to reconstruct the phase space of underwater noise time series based on nonlinear dynamics theory.

以非线性动力学理论中的相空间重构理论为基础，利用延时法对水下噪声时间序列信号进行了相空间重构。

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These underwater noise reminded the submarine crews of frog croaks, so they called the sound "quackers" (from the Russian word for frog sounds).

这些水下的声音使船员们想到了蛙叫，所以他们给这个声音取名叫“quackers”(来自于俄语，表示青蛙的叫声)。

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In the phase space, by using the similar sequence repeatability (RPT) and plotting the RPT curves it proved the nonlinear characteristics of the underwater noise.

在重构的相空间中研究了舰船辐射噪声的非线性特性，利用相似序列重复度这一参数，绘制了舰船辐射噪声rpt曲线并分析了其非线性特性。

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"The level and distribution of underwater noise is growing at a global scale but receives very little attention, " says Dr Slabbekoorn.

BBC: Earth News - 'Noise pollution' threatens fish

That means human-generated underwater noise has the potential to affect fish just as traffic noise affects terrestrial animals such as birds, say the researchers.

BBC: Earth News - 'Noise pollution' threatens fish

The International Whaling Commission said in July there was "compelling evidence" that entire populations of marine mammals were at potential risk from increasingly intense man-made underwater noise.

BBC: NEWS | Science/Nature | The deafening sound of the seas