The horizontal direction of train running noise is a important character of train radiating noise.

铁路列车运行噪声的水平指向性是铁路列车噪声辐射的重要特性之一。

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The horizontal direction of train running noise is a important character of train radiating noise.

铁路列车运行噪声的水平指向性是铁路列车噪声辐射的重要特性之一。

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