movable feast
noun /ˌmuːvəbl ˈfiːst/
/ˌmuːvəbl ˈfiːst/
- a religious festival, such as Easter, whose date changes from year to year
因年而异的宗教节日（日期每年都可有变化） - (figurative) Precise launch times for new products are something of a movable feast.
新产品的精确发布时间是一场可移动的盛宴。
- (figurative) Precise launch times for new products are something of a movable feast.