I am busy, so it's up in the air.

我很忙，所以我还不能确定。

youdao

Beyond that, what level of detail and user profiling is up in the air at this point, though it's likely to include a record of your personal contributions to the site.

除此之外，用户资料详的细程度目前尚未定下来，不过其中很有可能会包含用户个人对网站所作的贡献。

youdao

I saw the traffic jams and wondered if it's possible to make buses high up in the air as well.

当我在路上遇见堵车，就会想是不是可以让公交车也在空中运行。

youdao

Do you think that Americans should be prepared for the chance that this will probably happen, or do you think it's totally up in the air?

WHITEHOUSE: Press Briefing

Our friends at TC are suggesting something more "serious games" focused, or perhaps something involving Niantic Labs' Ingress MMO, but it's all up in the air at this point.

ENGADGET

Mr. DICKERSON: Well, it's all very much up in the air.

NPR: Slate's Politics: Will Card Resignation Soothe GOP?