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千载难逢（俚语）
1、a blue moon───不可能的事; 许久；n.不可能的事
2、a blue───蓝色的
3、like a moon───像月亮一样
4、a moon river───月亮河
5、Blue moon───n.不可能或稀有的时期或事情
6、in blue───穿蓝色衣服
7、once in a blue moon───adv.千载难逢地; 俟河之清; 百年不遇；千载难逢；极为罕见
8、in the moon───在月球上
9、in a blue mood───心情不好；情绪低落；心境不好
1、Since our parents live so far away, in recent year we get to see them once in a blue moon.───因为父母住在远处，所以我们近来很少和他们见面。
2、If you only send faxes once in a blue moon, do it from Staples or a copy shop.───如果您只发送传真一次在一蓝色的月亮，也从史泰博或复印店了。
3、He is not very keen on swimming. Only once in a blue moon do we meet him in the swimming pool.───他不喜欢游泳，我们很难得在游泳池遇到他。
4、You're the kinda guy, a girl finds in a blue moon.───你是那种人，在一个蓝色的月亮找到一个女孩。
5、In recent years, we don't often get a chance to visit our grandparents. They live so far away. We get to see them once in a blue moon.───最近几年，我们很少有机会去看望祖父母。他们住的太远了，见一面真有千载难逢之感。
6、How can you let such a golden opportunity to make big money slip through your fingers? It was an opportunity that comes once in a blue moon.───这样一个发大财的机会千载难逢，你怎么能眼睁睁地让它溜掉呢。
7、Sally: Wow, this is really a chance once in a blue moon. Please invite me to go with you!───哇，这真是千载难逢的好机会。求求你邀请我跟你一起去嘛！
8、His parents are very strict with him and allow him to go out with his pals in the evening only once in a blue moon.───他的父母亲对他很严格，难得准许他和朋友们在晚上一起出去。
1、That happens only once in a blue moon, when the weather is cold enough and thus the ice thick enough.
2、It only happens like this once in a blue moon.
3、We go out to eat once in a blue moon.
4、I see her once in a blue moon.
5、That kind of chance comes once in a blue moon.
6、So now he just comes round once in a blue moon.
7、Once in a blue moon Eric will offer to help with the dishes, but usually he doesn't do any housework at all.
8、Once in a blue moon you get some problems.
9、I haven't seen you in a blue moon.