这就是HTML5规范中许多新元素(例如进度条、视频，和音频标签)的来源。
That is where a lot of the new elements in the HTML5 spec (like the progress bar, video, and audio tags) came from.
可汗还说到，这里的学生们能够按照自己的学习进度来观看教学视频，学习课程。
Khan said students also learn the study material at their own speed through videos.
本文的多视频多窗口显示系统及软件设计在调试中取得了阶段性成果，验证了课题的可行性，课题进度令人满意。
In this paper, the multi-video multi-window display system and software made initial success in debugging. It proved the feasibility of the topics, and the progress is satisfied.
本文的多视频多窗口显示系统及软件设计在调试中取得了阶段性成果，验证了课题的可行性，课题进度令人满意。
In this paper, the multi-video multi-window display system and software made initial success in debugging. It proved the feasibility of the topics, and the progress is satisfied.
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