ABSTRACT
Natural languages, particularly written languages, in which qualitative words play an important role, are powerful tools for human thinking, and the use of means is the fundamental difference between the intelligence of humans and other creatures. Human brains and computers are the carriers of human intelligence and artificial intelligence (AI), respectively. If AI based on the quantitative calculation could take natural language as a way of thinking, then we have to work out a bridge to fill the gap between the two carriers, which is performed by qualitative and quantitative formalization.
