By introducing two special variables, namely the heterogeneity of agents and the task difficulty, this paper investigates the inter-relationship between the two variables and the salary gap.

In the teaching practice, the author has doubts of poor learning in the case study, conducting observation and reflection, the author thinks the main problem lies in the case study design.

Yingxian wooden pagoda locates in Fogong Temple, Ying County, Shanxi Province, and it has been listed the first batch of key historical sites under state protection.