为了定位那些地下商店，搜集者们用挖掘或敲击地面，听底部空洞的声音来寻找洞穴。
To locate the underground stores, gatherers looked for entryways to burrows or thumped the ground and listened for hollows.
回声定位是用超高频率的声音来导航。
Echolocation is the use of ultra-high frequency sounds for navigation.
用本方法对实验中所检测的由声音产生的脑磁信号进行处理，降噪效果明显，定位精度由几十毫米提高到几毫米。
The validation and effect of the method proposed are obtained as it is used to deal with MEG data in laboratory evoked by 1kHz sound.
用本方法对实验中所检测的由声音产生的脑磁信号进行处理，降噪效果明显，定位精度由几十毫米提高到几毫米。
The validation and effect of the method proposed are obtained as it is used to deal with MEG data in laboratory evoked by 1kHz sound.
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