A crucial issue in a passive sonar system is detection of the spectral lines.

在被动声纳系统中，线谱检测是一个至关重要的问题。

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Detections of the spectral lines is an important issue in the passive sonar system.

在被动声纳系统中，线谱检测是一个至关重要的问题。

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And it can provide signal to sonar system for the use of function check and capability test.

同时还生成并向声纳系统提供这些信号作为声纳功能检查或性能测试之用。

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Because there is no clear definition of harassment, the Navy's efforts to deploy an up-to-date sonar system have been delayed for more than six years.

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They have played a decisive role in dozens of environmental victories, from the phasing out of lead in petrol in the 1970s to stopping the navy in 2003 from using a sonar system that would have deafened or even killed whales.

ECONOMIST: The environmental movement

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