equalizer fulcrum

例句：

1. 1. The engineer used an equalizer to adjust the sound levels in the recording studio.
   工程师使用均衡器来调整录音棚里的声音水平。
2. 2. The equalizer was designed to enhance the clarity of speech.
   这个均衡器被设计用来提高语音的清晰度。
3. 3. In music production, equalizers are used to control the balance between different frequencies.
   在音乐制作中，均衡器被用来控制不同频率之间的平衡。