Array ( [0] => Array ( [title] => L3A [link] => https://www.youtube.com/embed/tcO8YEVY-pQ ) [1] => Array ( [title] => L3B [link] => https://www.youtube.com/embed/49RM6M7e5MM ) [2] => Array ( [title] => L3C [link] => https://www.youtube.com/embed/HZ9AYrVTAH4 ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第3R講 The Local Theory of Curves Parametrized by Arc Length (cont.)