Process is performed under water, and no oxidization of product occurs, plus clean operation with low noise levels.

全过程都是在水中完成，没有产品氧化的可能，再加上更方便的清洁工作和更低的噪音。

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Models shown are highly recommended where a large mechanical or rotary shaft seal is required, and low noise levels are important.

这个型号强烈的推荐大型的机械或旋转密封轴是必需的，低噪音标准很重要。

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As would be expected, gear manufacturing costs increase sharply with increase precision-as required for the combination of high speeds and heavy loads, and for low noise levels.

正如所料，高速重载及无噪音齿轮传动要求齿轮有高的精度，高精度的齿轮加工成本大大增加。

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Its scientific committee said low-frequency ambient marine noise levels had increased in the northern hemisphere by two orders of magnitude over the last 60 years.

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

According to Navsys, the company that developed JLOC, it involves a network of GPS receivers capable of detecting regions of higher than normal signal levels and low signal-to-noise ratios, either of which can indicate interference.

ECONOMIST: GPS jamming