... 音响探测 acoustic detection 音响通信 sound communication 音响伪装 acoustic camouflage ...
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水下音响通信系统 [通信] underwater acoustic communication system
国家用于人民防空通信的专用频率和防空警报音响信号，任何组织或者个人不得占用、混同。
No organizations or individuals may use the same frequency or the same acoustic signals as those specially used by the State for civil air defense communications or air defense warning.
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