cloudy
不容乐观

例句：
The future of international trade lookd very cloudy.
国际贸易的前景看来很是不容乐观。

up in the air 
悬而未决

例句：
Why did Charles leave so suddenly? All his affairs are up in the air.
查理为何那样匆匆离去? 他的事情都还没有搞定呢。

I'd like to reserve two seats.
我想预订两个座位。

例句：
A: I'd like to reserve two seats for tomorrow night.
B: The box seats are still available.

明天晚上我想预订两个座位。
包厢还有空座位可以预订。