等程差曲线的英文

• curve of equal path difference
• curve of equal retardation

• 等:    class; grade; rank
• 程:    rule; regulation
• 差:    send on an errand; dispatch
• 曲线:    curve; curved line
• 等程差面:    surface of equal path difference

其他语言

等程差曲线的日语：とうろていさきょくせん