Husserl s phenomenology is not easy to understand with its unique thinking mode and variety,and a tentative study of the theoretical beginning of Husserl s phenomenology is important for understanding his theory.

The study direction in the future is to establish open-celled theory for continuous extrusion in order to realize the transform of achievements in the laboratory into commercial applications as soon as possible.

This essay has briefly stated the function and functioning principles of SIgA,analyzed the functioning mechanism and the influence that exercise has on the level of SIgA,and made a tentative study about the functions on the changes of SIgA caused by exercise in “open window”theory and URTI.