acoustics of open-air的用法和样例：
- The acoustics of this concert hall are excellent.
- A series of open air events has been organised by the Chinese Festivity Group. The festival will be held in Bath Lane, Stowell Street , Waterloo Street and Charlotte Square.
- In front of us we saw a stretch of open fields.
- The acoustics of the hall are so good that you can hear everything even from the cheapest seats.
- The acoustics of this theater are admirable.