The Korean scientists, however, want to harness a different kind of powersource: sound waves.
然而,韩国科学家想驾驭一种不同类型的能量源,那就是声波。
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To verify the accuracy and reliability of the system, contrast tests on reference soundpowersource and small motor are performed respectively in a semianechoic chamber and a common room.
Sound waves travel outward like balloons expanding around their source. The sound's power is distributed on the surface of the wave which increases with the square of the distance from its source.