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a bolt from/out of the blue
The news of his marriage was a bolt from the blue. 他结婚的消息真是出人意料
Her dismissal came as a bolt from the blue. 她被解雇简直就是晴天霹雳
It was a bolt out of the blue when Yuki resigned. Yuki辞职令人大感意外
She had given us no warning she was going to leave; it came as a complete bolt from the blue. 她预先没有告诉我们她要走，这真是太突然了
