回复Susan
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> Susan wrote: >MIT: over 1800 class materials, but only a handful of audio/video lectures. > >http://ocw.mit.edu/ > >Yale: 7 "most popular" liberal art classes. > >http://open.yale.edu/ > > >So it is true: the best things in life are free.
用两个手指一起，可以上下滑动文本编辑区。
