https://www.youtube.com/watch?v=eMTyEpigXXc&feature=youtu.be
Youtube上一段很有啟發性的視頻講述燈與視力的關係
百字令929 (2015-03-23 04:34:25) 評論 (0)https://www.youtube.com/watch?v=eMTyEpigXXc&feature=youtu.be
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Youtube上一段很有啟發性的視頻講述燈與視力的關係
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