The phrase "to demonstrate the strength" means to show or prove how strong or powerful someone or something is. It is about showcasing their abilities or capabilities in order to impress or convince others. Full definition
In addition, the system will report detailed information about how well groups of students demonstrated their strengths in specific, key skills. (cde.ca.gov)
The show reported its highest attendance numbers on record, once again demonstrating the strength of the pet industry. (petbusiness.com)
Well - rounded and highly versatile with demonstrated strengths in both people and technology management. (members.climber.com)