blue

这个消息来得太突然了，震惊了所有人。

The news came out of the ___blue, shocking everyone.

他突然宣布辞职，让公司陷入混乱。

His resignation, announced out of the ___blue, left the company in turmoil.

会议中，这个问题的解决方案意外地出现了。

A solution to the problem appeared out of the ___blue during the meeting.