Array ( [0] => Array ( [title] => L3A [link] => https://www.youtube.com/embed/CubSAQha7VA ) [1] => Array ( [title] => L3B [link] => https://www.youtube.com/embed/UC16WAn1cLY ) [2] => Array ( [title] => L3C [link] => https://www.youtube.com/embed/aqAU7Yaz7Gg ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第3講 crystal structure + stereographic projection