silencer with volume expansion and pressure reduction

例句：

1. 1.The silencer is designed to reduce noiselevels in the area.
   这个消声器旨在降低该区域的噪音水平。
2. 2. The silencer was a crucial component of the communicationsystem.
   消声器是通信系统的关键组成部分。
3. 3. The silencer helped to mufflethe sound of the machinery.
   消声器帮助减弱了机器的噪音。