短语 up in the air 的意思是由于很多不定因素从而无法对某事的最终结果下论断，就像汉语里常说的“悬而未决”。
- The doctor told me I can't travel because I need to get some vaccinations done first. I'm not sure I’ll be able to go on Wednesday - it's all up in the air!
- It's all up in the air right now: no one can agree on whether to sell the company or not.
值得注意的是，另一个和单词 air 有关的短语是 clear the air，它的意思是通过对话消除误会、隔阂。
- My dad was really annoyed at me for forgetting his birthday. Last night we discussed it and cleared the air.
- I didn't know how my wife felt about the situation, so last night we talked for two hours and cleared the air.