Array ( [0] => Array ( [title] => L26A [link] => https://www.youtube.com/embed/p18m2HZhza8 ) [1] => Array ( [title] => L26B [link] => https://www.youtube.com/embed/rhVR4oxJAag ) [2] => Array ( [title] => L26C [link] => https://www.youtube.com/embed/y1JvQ9xfE0Y ) [3] => Array ( [title] => L26D [link] => https://www.youtube.com/embed/H2CWDkgNXn0 ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第26R講 交比的幾何意義