Anyone knows what to do, what else can I do except for repairing the elevator after graduation?

There are a lot of practical purposes. The professional knowledge when reading is just a patch -to -pork tile.
It, in terms of professional knowledge: you can enter the elevator factory, sell elevators, and sell before sale.
In most people do not engage in the industry of their own major after graduation.
The key is to rely on their own development after graduation to find an industry and position that suits them.