formality

n. /fɔːrˈmæləti/ C1

例行程序；礼节

A thing that you must do to obey rules, though unimportant.

仙境例句

For the Queen, a trial was only a formality; the answer was always “Off with his head!”

对王后来说，审判只是走个过场，结论永远是“砍掉他的头！”