https://online2.tingclass.net/lesson/shi0529/0009/9907/214.mp3
https://image.tingclass.net/statics/js/2012
講解文本：
out of the blue 出乎意料，突如其來
There are so many things out of the blue in our life.
生活中就是有這么多出乎意料。
The job offer came out of the blue.
這個工作機(jī)會來的很突然。
瘋狂練習(xí)吧!
