His hi-fi set has super acoustic quality.
他家的组合音响音质超棒！
He doesn't know how to turn up the volume on the hi-fi set.
他不知道如何使音响的音量增大。
The Technique of Super Class A Hi Fi Amplifier with the Front Electron Tube Set Behind the Transistor
前胆后石超甲类高保真功放研制
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