I downloaded a few lossless songs and used Loseless AudioValidator to detect them directly, and used Gold wave to view the spectrogram (the spectrogram of other software is not high-definition enough). The high-frequency extension of 22kHz is lossless, 21k is 320, and 20k is 256, 19k is 192, it’s absolutely true. By the way, Kuwo Music can now be downloaded for free without any loss