仪器在会话附近传输信号，并传递音频信号给个人，那是通常无法被别人知道的声音。
The instruments transmit nearby conversations and deliver audio commands to individuals that are usually unaware of the voices.
仪器在会话附近传输信号，并传递音频信号给个人，那是通常无法被别人知道的声音。
The instruments transmit nearby conversations and deliver audio commands to individuals that are usually unaware of the voices.
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