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更新日期：2016-08-03
檔案大小：3.7M
目前版本：1.02
版本需求：Android 2.3 以上版本
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It use different sonic sounds of high frequency. Dogs can hear sound at higher frequencies than humans can. A dog whistle exploits this by emitting a high frequency sound to call to a dog. Many dog whistles emit sound in the upper audible range of humans, but some, such as the silent whistle, emit ultrasound at a frequency in the range 18–22 kHz.
