once in blue moon

难得一见千载难逢的机会千载难逢的好机会千载难逢

once in blue moon 近义词

once in blue moon

等同于 now and then

once in blue moon

等同于 occasionally

once in blue moon

等同于 on and off

once in blue moon

等同于 once in a while

once in blue moon

等同于 rarely

once in blue moon

等同于 seldom

once in blue moon

等同于 sometimes

once in blue moon

等同于 sporadically

once in blue moon

等同于 hardly