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如何表达“千载难逢；极为罕见”呢？
once in a blue moon
very rarely
很少
once after a long time
很久之后
something that happens very seldom
很少发生的事情
如何运用：
I heard Kim became a membership in the gym.
I don’t know why he bought that membership card, he uses it once in a blue moon.
我听说Kim成为了健身房的会员。
我不知道他为什么买那张会员卡，他基本不用的。
跟读练习：
I think my grandson doesn’t love me anymore, he comes to see me only once in a blue moon.
我想我的孙子不再爱我了，他很久都不来看我了。
