脫口說英語口語生活習(xí)語大全O-6：once in a blue moon 極為罕見

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　　A:The river is much higher than the ground.

　　A:河比地高得多。

　　B:How dangerous!

　　B:多危險呀!

　　A:Yes, it is.

　　A:是呀。

　　B:What if the river overflowed its bank?

　　B:河水要是漲過了岸，怎么辦?

　　A:That would be disastrous.

　　A:那可遭殃了。

　　B:The whole city will get flooded?

　　B：整個城市就會被水淹了?

　　A:Of course. But that happens only once in a blue moon.

　　A:就是，不過那百年也不見得會遇上一次。