1·But muffling gasoline engines reduces their power to such an extent that the plan is impractical.
但消声汽油发动机降低了他们的权力，如此的程度，这个计划是不切实际的。
2·The perforating shield contributes a lot in improving the muffling effect and at the same time has a function of eliminating the pulsating sound in the engine exhausting noise.
穿孔屏对改善消声效果有较大的作用，同时，对发动机排气噪声中的脉动声有较好的消除作用；
3·Noise isolation, noise absorption and muffling are individually applied to each region in accordance with their feature.
根据不同分区内噪声的特点，在不同控制区分别采用隔声、吸声和消声等噪声控制技术。
4·Muffler is the conventional muffling device in the noise control of compressor.
消声器是压缩机噪声控制中常用的消声装置。
5·The sound absorbing device (22) is provided with a plurality of mutually different absorption areas (24) on the aspect of depending on the muffling performance of the frequency.
吸声装置(22)具有多个在其取决于频率的消声性能方面相互不同的吸收区(24)。