muffler

a device that decreases the amplitude of electronic, mechanical, acoustical, or aerodynamic oscillations

减小电子、机械、声学或空气动力振荡幅度的装置

damper

a scarf worn around the neck

戴在脖子上的围巾

a tubular acoustic device inserted in the exhaust system that is designed to reduce noise

一种插入排气系统的管状声学装置，用于降低噪音

silencer