Array ( [0] => Array ( [title] => L9A [link] => https://www.youtube.com/embed/Pe_5Vgt4O5Q ) [1] => Array ( [title] => L9B [link] => https://www.youtube.com/embed/b6jgUHZAfhU ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第9R講 Mechanical Energy in a Saturable System