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例子
She received a phone call out of the blue from a childhood friend she hadn't spoken to in years.
The sudden storm arrived out of the blue, catching many people unprepared.
Hearing that he had been selected for the prestigious award was a bolt out of the blue, leaving him overwhelmed with gratitude.
The invitation to the party came out of the blue, and I couldn't believe my luck.
They decided to move to another city out of the blue, surprising all their friends.
