out of the blue

常见例句

The image of the woman popped into his head out of the blue.
那个女人的形象突然出现在他的脑海里。
This hardly ever happens out of the blue: there are usually warning signs such as noise, vibration or heat.
机器是不可能突然故障的：通常机器在故障前会有告警信号，例如噪音、振动或发热。
Then, about 15 minutes down the motorway, out of the blue, he announced I was heading in the wrong direction for Weymouth.
然后大约15分钟后开下了高速公路，他出人意料地宣布我前进去韦茅斯的方向是错的。

"Most of the fish,shrimp, blue crab they are spawning out in the Gulf right now, and any of those really small larvae fish and crab, is probably going to be killed if they encounter the actual oil spill."
I was taking my younger child home from a play date on Sunday and he asked me out of the blue, ?" "Why can't you marry your mother or your father?"
周日我带我的小儿子去玩，回家的路上,他突然问我，“你为什么不能和你的父母结婚“
耶鲁公开课 - 心理学导论课程节选
and I kind of want to go somewhere that's just out of the blue that I never even thought of,
我想去意想不到的地方，自己根本没想过的，
为我的生活 - SpeakingMax英语口语达人

What would you do if your responsibilities at work radically changed out of the blue?
FORBES: What To Do When They Radically Change Your Job
Maybe the concept came to you in a flash, the proverbial bolt out of the blue.
FORBES: You Have THE BIG IDEA, What Do You Do Next?
Then, out of the blue, her lonely birth-mother, Ellen, contacts the daughter given up at birth.
ECONOMIST: Memoirs of adoption