教材中关于时间膨胀效应的阐述，都是以特殊情况作为例子进行推导.为了深入地探讨在一般情况下时间膨胀效应是否仍然满足，本文从特殊角度出发，通过变换反射镜的位置改变光路，阐述了各种条件下时间膨胀效应的普适性.希望给学习狭义相对论的师生提供参考,加深对时间膨胀效应的认识.

The conclusion of time dilation effect is obtained usually through an example in special case in the textbook.In order to deeply explore whether the time dilation effect is still corrected under general conditions，this paper expounds the universality of time dilation effect by changing the position of the mirror and the optical path.We hope it can provide a reference for teachers and students studying special relativity，and understand deeply of the time dilation effect.