As a public academic activity,the purpose of the middle-level theory is to become a“bridge”linking the field of surprise and wonder with the existing explanations,especially classical theories,which will contribute to the professionalization and standardization of the s...MORE As a public academic activity,the purpose of the middle-level theory is to become a“bridge”linking the field of surprise and wonder with the existing explanations,especially classical theories,which will contribute to the professionalization and standardization of the...