To predict the major sources of low-frequency noise and reduce it are recent difficulties in researching the vehicle interior noise.

在研究汽车车内噪声的过程中，判断低频噪声的主要来源和降低车内低频噪声水平是一个难点。

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To predict the major sources of low-frequency noise and reduce it are recent difficulties in researching the vehicle interior noise.

在研究汽车车内噪声的过程中，判断低频噪声的主要来源和降低车内低频噪声水平是一个难点。

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