Array ( [0] => Array ( [title] => L4A [link] => https://www.youtube.com/embed/4_VlJaYS8FQ ) [1] => Array ( [title] => L4B [link] => https://www.youtube.com/embed/2TNLS_M1bsA ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第4R講 Chapter 1 : Where ODE comes?