The ceiling of the barbecue industry means that the barbecue technology has reached its peak, which belongs to the highest level and can hardly be surpassed. "ceiling" refers to doing the best in this industry or a certain job, and others can reach this level no matter how high.

Extended data:

The ceiling, rice circle and finger top are so high that they can hardly be surpassed. For example, the singer ceiling is the best singer. If you don't approve, don't use it casually, ceiling = superlative meaning.

After most officials reach a certain level, the promotion space is getting smaller and smaller, thus meeting the "ceiling" of their career at different stages. Officials in this situation are vividly called "ceiling" officials.