复声源 [声] compound sound source

复声强 complex sound intensity

一声低沉的回复声 a muffled reply

复声的 multi-voices

复合扬声器 combination loudspeaker

阻抗复合消声器 impedance muffler ; impedance composite muffler

复合式消声器 compound silencer ; combined type muffler ; [声] complex muffler

复式扬声器 compound loudspeaker

声音修复系统 Sound Retrieval System

复音声响讯号装置 multi-tone sound signalling device