Array ( [0] => Array ( [title] => L11A [link] => https://www.youtube.com/embed/f13wGeA5HKc ) [1] => Array ( [title] => L11B [link] => https://www.youtube.com/embed/Lt7OkqP-BQo ) [2] => Array ( [title] => L11C [link] => https://www.youtube.com/embed/UI25cdaQhnQ ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第11R講 Elasticity of substitution