As an economical and effective method, the expressway noise barrier is a primary measure to reduce traffic noise.
高速公路隔声屏障作为一种经济有效的方法，是降低交通噪声的主要措施。
Using na cell to reduce airplane noise is an important method.
使用消声短舱是降低飞机噪声的重要方法。
Noise barrier is a kind of effective and economical method to reduce traffic noise.
声屏障是降低交通噪声等流动性声源的一种有效而经济的方法。
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