Array ( [0] => Array ( [title] => L1A [link] => https://www.youtube.com/embed/xic0cQdFVJM ) [1] => Array ( [title] => L1B [link] => https://www.youtube.com/embed/cMTWxAk9oK8 ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - Lecture 1 | Flows and differential equations; Transformation of vector fields