Array ( [0] => Array ( [title] => L12A [link] => https://www.youtube.com/embed/QVqmdoS3t4Y ) [1] => Array ( [title] => L12B [link] => https://www.youtube.com/embed/Ah3IMYLqgto ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - Lecture 12 | Center manifolds(applications)