Array ( [0] => Array ( [title] => L1A [link] => https://www.youtube.com/embed/v9M_JxoISI0 ) [1] => Array ( [title] => L1B [link] => https://www.youtube.com/embed/whiKpOEs2Ds ) [2] => Array ( [title] => L1C [link] => https://www.youtube.com/embed/ZVhxp0zJQn4 ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第1R講 Parametrized Curves, Regular Curves and Arc Length