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。

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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。

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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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