自从音乐软件支持无损音乐以来，给手机接上“小尾巴”，再连接一个专业耳机的人越来越多了。在此之前，很多音乐爱好者也会给自己的设备外接上一大堆“砖头”。这些价值成千上万的设备到底是什么？他们真的能让音乐更好听吗？为什么不直接用蓝牙耳机？
Since music software supports lossless music, more and more people are connecting external devices to their mobile phones and then connecting them to professional headphones. Before this, many music lovers would attach a lot of "bricks" to their devices. What exactly are these devices worth thousands of dollars? Do they really make music sound better? Why not just use Bluetooth headphones?
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