Sound echo 声波回声
sound echo-counteracted 声回声抵消
sound echo-counteracted device 声回声抵消器
By hanging panels of sound absorbing felt on the walls, Sabine reduced the echo enough to make the hall usable.
通过在墙上悬挂吸音板，Sabine 减少了足够的回声，使大厅可用。
Usually, as they swim, they make clicking noises, and the resulting sound waves are reflected in an echo and travel back to them.
通常，当它们游泳时，会发出咔嚓的声音，所产生的声波会在回声中被反射回到它们身边。
The data he compiled yielded a mathematical formula for the relationship between a room's echo duration, its quantity and quality of sound-absorbing materials, and its spatial volume.
他收集的数据得出了一个关于房间回声持续时间、吸音材料的数量和质量以及空间体积之间关系的数学公式。
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