open-air

名词 open-air:

1. where the air is unconfined
   同义词：outdoors, out-of-doors, open air, open

形容词 open-air:

1. in the open air
   同义词：alfresco

o.pen-air

adj.（形容词）
Outdoor:
户外的：
例句：
an open-air concert.
一场露天音乐会