listening key

例句：

1. 1.The listening key is a crucial component of the audio interface.
   监听键是音频接口的关键组成部分。
2. 2.The engineer needs to adjust the listening key to optimize sound quality.
   工程师需要调整监听键以优化音质。
3. 3. The music player has a built-in listening key that allows for easy adjustments.
   这款音乐播放器内置了监听键，便于轻松调整。