Pupils from the second primary school affiliated to the Tianjin Normal University work in simulation of fire fighters during an activity of the winter camp, in Tianjin, north China, Jan 22, 2011. Students in Tianjin are fond of spending their winter vacation in the camp to experience grown-up lives in simulation of different social roles. [Photo/Xinhua] 

A boy from the second primary school affiliated to the Tianjin Normal University works in simulation of a radiobroadcaster during an activity of the winter camp, in Tianjin, Jan 22, 2011. Students in Tianjin are fond of spending their winter vacation in the camp to experience grown-up lives in simulation of different social roles. [Photo/Xinhua]