My First Summer Vacation at SJTU——My Part-time Job as a Market Behavior investigator(原作)It was very busy that my first summer vacation at SJTU was. not as relaxing as former vacations. I had a quite important thing to do in the summer vacation, My First Summer Vacation at SJTU——My Part-time Job as a Market Behavior investigator(Original)It was very busy that my first summer vacation at SJTU was. not as relaxing as former vacations. I had a fairly important thing to do in The summer vacation,