nondirectional microphone

例句：

1. 1.The engineer used a nondirectional microphone to record the sound of the crowd.
   工程师使用无方向麦克风录制人群的声音。
2. 2.In this recording, the nondirectional microphone was placed at the center of the room.
   在这个录音中，无方向麦克风被放置在房间的中心。
3. 3. The nondirectional microphone is essential for capturing the natural sound of the environment.
   无方向麦克风对于捕捉环境的自然声音至关重要。