Array ( [0] => Array ( [title] => L58A [link] => https://www.youtube.com/embed/hhHtTgGW6V8 ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第58講|Lecture 12 Electrodynamics and Relativity|12_1B 12_1 The Special Theory of Relativity : Length Contraction