传统的噪声控制主要是从减低人耳听力损伤方面考虑来进行噪声控制的——降低噪声声级。
Traditional noise control mainly focus on reducing the damage to human ear by decrease noise.
最后讲述如何在设计和管理上控制列车的辐射声级，使之满足铁路边界噪声限值的要求。
Finally, the paper gives its view on how to control the radiant noise level through design and management in order to satisfy the requirements on railway boundary noise limit.
烟尘控制区逐年扩大，市区区域环境噪声等效声级56.6分贝，达到国家规定的控制目标。
Smoke and dust control area is extending year by year, and noise in urban area is controlled below 56.6 DB, meeting the national standard.
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