Array ( [0] => Array ( [title] => L14A [link] => https://www.youtube.com/embed/zczv15t5zbQ ) [1] => Array ( [title] => L14B [link] => https://www.youtube.com/embed/xEzNsVjXSuw ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第14R講 Why can light propagate in vacuum? (II)

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第14R講 Why can light propagate in vacuum? (II)

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