Ten years ago MIT decided to post videos of all university lectures and the course plan for every course online, for free, for all of humanity.

10年前，麻省理工学院决定推出免费的在线视频讲座，任何人都能在网上学习麻省理工学院的所有课程。

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Nearly everything, from texts to videos of lectures, is available online free.

网上几乎有所有的材料，不论是课文文本还是讲座视频，这些还都免费。

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Some programs simply post videos of lectures or reading material online with little emphasis on whether students understand the material.

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