https://online2.tingclass.net/lesson/shi0529/0009/9907/331.mp3
https://image.tingclass.net/statics/js/2012
讲解文本：
up in the air 拿不准，没有决定，悬而未决
His new job is still up in the air.
他的新工作还没有着落呢。
I don't know what to do. Everything is up in the air.
我不知道做什么，一切都还是未知数。
疯狂练习吧!
