out of the blue "突然"、“晴天霹靂”、“出乎意料”
1、It's kind of out of the blue that he is leaving tomorrow.
他明天就要離開，這來得有點突然。
2、Tom lost his job last week. Don't think it's out of the blue?
阿湯哥上周失業(yè)了。這太出乎人的意料了，不是嗎？