air dome is being used to cover a martial arts hall.

An air dome is a large inflatable structure that can be used to cover a variety of spaces, including sports facilities.  In this case, the air dome is being used to cover a martial arts hall. 

The purpose of using an air dome to cover a martial arts hall could be several.  One reason could be to provide protection from the elements, such as rain, snow, or extreme heat or cold.  The air dome would create a barrier between the indoor space and the outdoor environment, allowing for year-round use of the martial arts hall. 

Another reason could be to create a larger, more flexible space for martial arts training and events.  By covering the hall with an air dome, the space could be expanded without the need for costly construction or renovation projects. 

Overall, the use of an air dome to cover a martial arts hall offers many benefits, including protection from the elements, increased flexibility, and potentially lower costs compared to traditional construction methods.