In school, every day always see roommates to knock the code of the code, every time I see all feel very not code, a began to follow the footsteps of others to knock, but gradually found himself can't keep up with the speed of others, someone knocked code can be a few hours, but he is half an hour every day, occasionally there may be no, learning speed slow down can produce anxiety, slowly led to I can see someone knock code can produce anxiety,