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The humanity may hear generally the in 1 hertz to 20 kilohertz between, scope reaching as high
as which the dog branch animal will hear is near 40 kilohertz.Causes in view of this characteristic to be
stranded can launch in the rubble or the mountainous area victim high frequency causes the dog class rapid confirmation the position position which is stranded,in the coordination the heat energy perceptron and the manpower or the machines and tools excavation, rapid will receive is stranded the disaster victims to rescue,avoids in the rescue the valuable time.
Taipei City, Taiwan