Array ( [0] => Array ( [title] => L18A [link] => https://www.youtube.com/embed/qXcAeavoBRc ) [1] => Array ( [title] => L18B [link] => https://www.youtube.com/embed/KsjaYJdFF9s ) [2] => Array ( [title] => L18C [link] => https://www.youtube.com/embed/XE-73Yf-VCQ ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第18R講 Parallel Transport and Geodesics (cont.)