back-ball method

• 回弹法

back-ball method的用法和样例：

例句

1. Based on the conventional digital photoelastic method, this dissertation developed a digital dynamic photoelastic system to record the dynamic photoelastic fringe patterns.
   本文是以数位光弹法为基础，架设一套数位动态光弹系统来拍摄动态光弹条纹。