recorder capstan

例句：

1. 1. 音高计
   音高计
2. 1. The recorder was used to capture the sound of the bird.
   录音器被用来捕捉鸟儿的声音。
3. 2. The recorder is essential for recording important events.
   录音器对于记录重要事件至关重要。
4. 3. The recorder was used to play back the recordings made by the camera.
   录音器被用来播放摄像机录制的录音。