조회 수 67 추천 수 0 2015.01.21 07:49:35
Getting prescription glasses isn't a big deal for most Westerners, but in poor countries such as Rwanda it can require substantial time, effort and money. But now, thanks to a British scientist,...
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원문출처 : http://www.youtube.com/watch?v=D9FpEWQkg-w&feature=youtube_gdata