a bolt from the blue (蓝天上的一道闪电)

Idiom Surprise

含义

a sudden and unexpected event or news

突然和意想不到的事件或消息 (turan he yixiang bu dao de shijian huo xiaoxi)

例句

"His resignation came like a bolt from the blue."

"他的辞职就像晴天霹雳一样。" (ta de cizhi jiu xiang qingtian pili yiyang)