Chapter32 Relativity △t=△t 固有时间:同一地点发生的两事件的时间间隔 When two events occur at the same location in an inertial reference frame. the time interval between them, measured in that frame, is called the proper time interval or the proper time. P741 1-(v/c)2 0 1 (v / c) t t    0 ' t  t 固有时间 ：同一地点发生的两事件的时间间隔 . When two events occur at the same location in an inertial reference frame, the time interval between them, measured in that frame, is called the proper time interval or the proper time. P741