out of the blue

基本解釋

The image of the woman popped into his head out of the blue.
那個女人的形象突然出現(xiàn)在他的腦海裡。
This hardly ever happens out of the blue: there are usually warning signs such as noise, vibration or heat.
機器是不可能突然故障的：通常機器在故障前會有告警信號，例如噪音、振動或發(fā)熱。
Then, about 15 minutes down the motorway, out of the blue, he announced I was heading in the wrong direction for Weymouth.
然後大約15分鍾後開下了高速公路，他出人意料地宣佈我前進去韋茅斯的方曏是錯的。

"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?guī)业男鹤尤ネ?，廻家的路上,他突然問我，“你爲什麼不能和你的父母結(jié)婚“
耶魯公開課 - 心理學(xué)導(dǎo)論課程節(jié)選
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，自己根本沒想過的，
爲我的生活 - SpeakingMax英語口語達人

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