https://online2.tingclass.net/lesson/shi0529/0009/9907/627.mp3
https://image.tingclass.net/statics/js/2012
out of the blue 突然的，意外的，出乎意料的
Mike told me this out of the blue.
麥克毫無預(yù)兆的就跟我講了這件事。
She dumped me out of the blue. I don't know why.
她突然就把我甩了，我完全不知道原因。
