movable feast

剑桥词典

a religious holiday that is not on the same day every year
节期因年而异的宗教节日
Easter is a movable feast . 复活节的节期因年而异。
informal
something that can happen at any time or place that suits people
无常事，并非一成不变的事
Lunch is officially from 12.30 to 1.00, although it tends to be a movable feast . 按规定午饭时间从12:30到1:00，而实际上往往是不一定的。 返回 movable feast