Due to the different application of the traditional "on-the-spot teaching" and the present modern-IT-based "on-line teaching" in the links of class preparation, teaching and practice, it is possible to create different teaching modes for "integration of classroom and Internet".

Presence is an important ontological category of philosophy, and the presence of man is also of profound philosophical meaning.

Human communication always occurs in some temporally and spatially defined situation,and the history of the development of human society is in a sense the process through which human beings transcend the communicative situation that requires physical "presence" and build connections,coordination,and social control in larger areas.

When we design a project on a tour for root seeking,we not only must take to its "presence",moreover also must pay attention to its "absence",in other words must take to have tourist s ancestor s each kind of factor,for example local natural landscape,humanities landscape and manners and customs and so on.

As the point of departure for esthetic logic,audio-visual has the following three aspects:(1) integrate truth and illusion,(2) not-present of present,(3) combine signifiant with signifié to the reasonableness and imagination.

They argue that the real world includes both the present and the absent, and the combination of the two is the goal of philoso.