bi-directional microphone
... omni-directional microphone 全向话筒 bi-directional microphone 双向传声器 vari-directional microphone 可变指向传声器 ...
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[电子]
bidirectional microphone
... 双向交通 two-way traffic 双向传声器 bidirectional microphone 双向传感器 bilateral transducer ...
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