To detect water leaking of underground tube, the traditional method relies on the sound-electricity transformation. Therefore, detection sensitivity, depth and distance suffer great limitation.

传统的检测地下管道漏水的方法是以声—电转换为基础，这使得灵敏度、深度和距离都受到很大限制。

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The optimal application of sound pole, leak detector and correlator supported by leak detection program have improved the accuracy of leak detection of underground water pipelines.

听音杆、检漏仪和相关仪等设备的优化使用，加之合理的检漏程序，提高了地下输水管道漏点检测准确率。

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Sound effects, like the noise of the underground, must also be added separately.

音响效果，像地铁噪音，也必须单独添加。

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She won a place in Girls Aloud through reality TV show Popstars: The Rivals in 2002, and their first single Sound of the Underground went straight to number one.

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Now, in this warren of rooms, except for the muffled sound of the crowd above, the only sound was the whooshing of an underground stream, redirected here from Roman times for irrigation and cleaning.

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