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What does BLUE mean?
"out of the blue＂
In this case,what does BLUE mean?
2018年11月6日 06:57
解答 · 4
2
The phrase comes from blue sky. It would be surprising to see rain come out of a blue sky, hence something that comes 'out of the blue' is a surprise.
2018年11月6日
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2018年11月6日
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