1.
sound attenuation
消声器（噪声衰减装置）
2.
This method broadens the silence frequency bandwidth of muffler and improves its silence fuction.
这种方法拓宽了消声器的消声频带宽度,改善了消声器的消声性能。
3.
Acoustics--Determination of sound power levels of noise sources--Precision methods for anechoic and semi-anechoic rooms
GB/T6882-1986声学噪声源声功率级的测定消声室和半消声室精密法
4.
The sound system is armed.
消声系统也严阵以待。
5.
silencer-filter type air intake
消声滤气器型空气进口
6.
air cleaner and silencer
空气净化器及消声器
7.
silencer(sound deadener)
噪音消声器（隔音材料）
8.
The Muffler of Election
竞选的“实质消声器”
9.
Characteristic Simulation and Improvement of the ATV Muffler;
全地域四轮车消声器消声性能仿真与改进
10.
Research on Noise Elimination Characteristics and CAD of Motorcycle Muffler;
摩托车消声器消声特性及计算机辅助设计研究
11.
Computer Simulation of Acoustic Performance of Motorcycle Muffler;
摩托车消声器消声性能的计算机仿真分析
12.
Acoustic Performance Analysis and Computer Aided Design of Muffler;
消声器消声性能分析及计算机辅助设计
13.
Research on Attenuation Performance of a Semi-Active Exhaust Muffler Based on CFD
基于CFD的半主动排气消声器消声性能研究
14.
The Contrast of Simple Expanded-muffler with Large Porosity Perforated Muffler
简单扩张式消声器与穿孔管消声器对比研究
15.
Influence of Rotation Velocity of Diesel on the Noise Elimination of Resistance Muffler
柴油机转速对抗性消声器消声效果影响的研究
16.
noise-killing battery
消杂音电池，消噪声电池
17.
Adaptive echo cancellation and noise reduction algorithm
一种自适应回声抵消和噪声消除算法
18.
The noise had died down.
喧闹声逐渐消失了。