1. I just bought a new hifi for my living room to enjoy high-quality sound.
我刚给客厅买了一套新的高保真音响系统，可以享受高质量的音乐声音。

2. He is a big fan of hifi and spends a lot of money on collecting audio equipment.
他是个高保真音乐的狂热爱好者，花了很多钱收集音响设备。