... sound emission 声发射 sound emitter 发声器 sound energy density 声能密度 ...
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The wheel web, by virtue of its geometry and material characteristics, is a good emitter of high-frequency sound, and is believed to be the primary source of curve squeal noise.
尺寸和材料的特性导致了轮辋是一个良好的高频声源，轮辋也被认为是曲线尖啸噪声的主要来源。
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In his hands is his latest invention, the HyperSonic Sound emitter.
FORBES: Now Hear This
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