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Sound wave flowing animation. Infrasound to audible acoustic ultrasound audio frequency. Herts Khz Mhz high low amplitude pitch voltage. Stream pan. For music medical earthquake education

视  频 ID:  1082407222
版      权:  grayjay
视频长度:  0:12
横纵比率:  16:9
所属分类:  科学 教育 
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