Array ( [0] => Array ( [title] => L12A [link] => https://www.youtube.com/embed/yFnhYMa5BSM ) [1] => Array ( [title] => L12B [link] => https://www.youtube.com/embed/nE586twj3Z8 ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第12講 Homework 2 Solution