gōng / chǎng / gěi / pái / qì / guǎn / ān / zhuāng / le / xīn / de / xiāo / shēng / qì / yǐ / jiǎn / shǎo / zào / yīn工厂给排气管安装了新的消声器,以减少噪音。The factory installed a new silencer on the exhaust pipe to reduce noise.