there is a chance once in a blue moon

This is a chance once in a blue moon, there is once in blue moon i havetogotowork,it's a blue Mond Once In A Blue Moon 歌词 You only get a chance like this once in a blue moon.这句话要怎么解释 Once in a blue moon 这句话话是啥意思啊 once in a blue moon 为什么 解释为 机会难得,绝无仅有? "I haven't seen her once in a blue moon. once in a blue moon 出处是哪里? 求魂音泉的once in a blue moon的罗马音 once in a blue moon 意思和once in a while一样嘛? 求歌词：once in a lifetime means there is no seond chance 歌词 请问 once in blue moon