The complete min-cut of the flow network induced from the finite state machine of a discrete event dynamical system is introduced so that the solution of the optimal supervisory control problem also includes the marked language.

SQL language(structured query language)is the standard language of database,choosed as a database teaching language,its outstanding advantage is that the definition of data,data query,data manipulation and control of the four major functions in the data integration.

The broad sense refers to literary language which can also be translated into standard language, but the narrow sense only refers to language used in literature, that is literary version language, which is written in literature by writers aiming at conveying feelings and meanings and showing creative ideas.