Array ( [0] => Array ( [title] => L21A [link] => https://www.youtube.com/embed/aDMiRO1a9Y4 ) [1] => Array ( [title] => L21B [link] => https://www.youtube.com/embed/zog13JSF9hE ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第21講 CH10 Liquids and Solids