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自由知识文化日历/7 月 19 日
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2000 年的今天，Vorbis 音频格式参考软件的第一个稳定版本 (1.0) 发布。Vorbis 提供了比 MP3 更好的音质。它只有在视频游戏等小众领域才取得了成功。
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书：自由知识文化日历
华夏公益教科书
