The application of the horizontal Wet-ESP has showed it has reached the environment protection standard of the flue gas from edge scarfer, so it can be substitute for the same type machines imported.
No one thinks such shows are substitutes for in-person performances, but they seem to be outliving the pandemic as an evolving entertainment category in their own right.
For their part, businesses like to claim that good substitutes for their products are everywhere: Netflix's boss once claimed the firm's main competitor was " sleep" .