A tape recording of several dozen voices talking at the same time, used as an antibugging device to make private or secret conversations inaudible to eavesdroppers.
英
美
- 防窃听多声磁带记录了许多同一时刻说话声音的磁带，用作一种防窃听装置使私人的或秘密的谈话不被偷听者听到
