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it is virtually free if no time invested.
MIT OpenCourseWare
麻省理工的免費網上課程
http://ocw.mit.edu/OcwWeb/Electrical-Engineering-and-Computer-Science/6-002Spring-2007/VideoLectures/detail/embed20.htm
download for off line view
http://all-streaming-media.com/streaming-media-faq/faq-download-MIT-OCW-streaming-video-lectures-to-my-computer-for-viewing-off-line.htm
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