在通信系统中，降低噪声是一个非常重要的问题。
In a communication system, the decrease of noise is very important problem.
为了更好发挥电动汽车环保作用，对电机系统进行了噪声分析，并对降低噪声的方法进行了初步探讨。
The noise of traction motor system is analysis to exertion the environment-protect role of EV. And the ways to decrease noise are detailed in the last.
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.
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