Logic language is opposite to
natural language. Natural language is the means by which people communicate with each other
while
logic language is the means by which people communicate with computer. According to cognitive science, cognition is logical operation of knowledge while thinking is computation. Any computerized analysis of
natural language mainly depends on the expression of the logic language. What it is seeking for the theory of cognitive science studying on the expression of the mind and computation is the physical reflection on mind study. This will eventually lead linguistic research to natural science study. The highly formative description of natural language is of vital importance to mechanical simulation of computer programme. Man's comprehenstion is quite different from mechanical simulation. The difference is quite similar to the one between form and meaning operations in natural language. Mechanical simulation deals with something formulated while comprehensive simulation involves quasi semantics quality. At present time computer mainly operates by mechanical simulation and communicate with man through logic language.