Li Shouchang(Li Dazhao) and Gu Jiegang were teacher and student working together for six years.Although they seemed to have kept a distant relationship,from the perspective of the general trend of the growth and decline of modern academic thoughts,Li Shouchang's idea of interpretation and the Gu Jiegang's concept of doubting the ancient with discriminations mirrored each other,each properly representing the two extreme points of the state of modern historical studies with essential implications of mutual su...