Up in the air
先写下记得的内容，再查看解释。不要填写个人信息。
查看解释
The idiom 'up in the air' means that a matter, plan, or decision is not yet certain or decided, often because additional facts or choices are needed. It does not mean the event is cancelled, impossible, or literally high above the ground; rather, it describes a situation that remains unsettled until a resolution arrives.
The repair schedule for my bicycle is still up in the air because the shop is waiting for a replacement chain.