https://online2.tingclass.net/lesson/shi0529/0009/9907/214.mp3
https://image.tingclass.net/statics/js/2012
讲解文本：
out of the blue 出乎意料，突如其来
There are so many things out of the blue in our life.
生活中就是有这么多出乎意料。
The job offer came out of the blue.
这个工作机会来的很突然。
疯狂练习吧!
