Generally, it is difficult to calibrate microphone sensitivity without special calibration instruments, which makes the maintenance of microphone can't be done frequently.
没有专门的校准设备通常难以进行测试传声器灵敏度校准，这个因素限制了传声器的日常校准。
Selectable microphone sensitivity allows optimal recording of personal dictation, small conferences or lecture halls.
最佳录音麦克风灵敏度选择允许个人听写、会议或演讲厅。
Selectable microphone sensitivity allows optimal recording of personal dictation, small conferences or lecture halls.
最佳录音麦克风灵敏度选择允许个人听写、会议或演讲厅。
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