Array ( [0] => Array ( [title] => L20A [link] => https://www.youtube.com/embed/Yxb2LtzRp3Q ) [1] => Array ( [title] => L20B [link] => https://www.youtube.com/embed/jNIK0UvbwIk ) [2] => Array ( [title] => L20C [link] => https://www.youtube.com/embed/hfpoVavGqE8 ) [3] => Array ( [title] => L20D [link] => https://www.youtube.com/embed/RkR8mRn0gWk ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第20R講 8.5 Improper integrals