MP3 转 M4A
把 MP3 转成 M4A 文件，无缝融入 Apple Music、iTunes 和 iPhone 的音乐库。
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MP3
The universal audio format. Small files that play on every device, app, and player made in the last two decades.
M4A
The AAC audio container used by Apple Music and iTunes. Better quality than MP3 at the same size.