AAC 转 MP3
把裸 AAC 流转成 MP3，任何播放器、应用和设备都能毫无障碍地打开。
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AAC
Raw AAC audio — MP3's successor, used in streaming and broadcasting. Efficient, but fewer apps open bare AAC files.
MP3
The universal audio format. Small files that play on every device, app, and player made in the last two decades.