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1. The automatic volume expander on my phone is very useful for adjusting the volume without having to touch thephone.
我手机上的自动调音器非常实用，可以不用触碰手机就能调整音量。
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2. The engineer used an automatic volume expander to increase the sound quality of the recording.
工程师使用了一个自动调音器来提高录音的声音质量。
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3. The automatic volume expander in the car's audio system can automatically adjust the volume based on the occupancy of thepassengers.
汽车音响系统中的自动调音器可以根据乘客的乘坐情况自动调整音量。