It was something that happens once in the blue moon.这是千载难逢的事

It was something that happens once in the blue moon.这是千载难逢的事 it happend once in the blue moon 请问 once in blue moon It is snowing down south ! Once in blue moon 意思 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 这句话话是啥意思啊 there is once in blue moon i havetogotowork,it's a blue Mond Once In A Blue Moon 歌词 once in a blue moon 为什么 解释为 机会难得,绝无仅有? 请用once in blue moon造句,多造几句..谢谢 This is a chance once in a blue moon,