Be up in the air 懸而未決的
It means not to be decided yet.
eg: The company is going to build a new factory, but the location is still up in the air.
They are eager to see the band U2 in concert, but their tour schedule is very much up in the air.
Note:
Be up in the air 的意思為懸而未決的，還未定下來的。
例：公司將要建一座新工廠，但是地址還未選定。
他們希望能在演唱會中看到U2，但是他們的演出行程非常不確定。
It means not to be decided yet.
eg: The company is going to build a new factory, but the location is still up in the air.
They are eager to see the band U2 in concert, but their tour schedule is very much up in the air.
Note:
Be up in the air 的意思為懸而未決的，還未定下來的。
例：公司將要建一座新工廠，但是地址還未選定。
他們希望能在演唱會中看到U2，但是他們的演出行程非常不確定。