At the same time Petri Net is a kind of abstract mathematics sign, and does not keep problem field a intuitionistic view.It is hard to comprehend, commune and discus for laypeople.

• 同时Petri网是一种抽象的数学符号，并不是对问题领域的直观的表示，对非专业人员来说难以理解、交流和讨论。