介绍了内燃动车降低噪声的措施。
The measures to reduce noise inside diesel motor cars are introduced.
分析了锅炉引风管道系统的振动。为了降低噪声，提出了减少振动的一些措施。
The vibration on blower pipe system of boiler is analyzed, some measures of decreasing vibration are presented in order to reducing noise of boilers.
声学材料是降低噪声，改善声环境的有效措施。
The acoustic material is an effective measure which could reduce noise and improve acoustic environment.
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