取得公安机关许可的经营者，违反国家有关管理规定，情节严重的，公安机关可以吊销许可证件。
There is a minor artefact in the final file. The stitched .m4a sometimes contains silent padding at the start or end from incomplete chunks at buffer boundaries. A quick ffmpeg pass fixes it cleanly:
，更多细节参见safew官方版本下载
get: func(x: u32, y: u32) - pixel;
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