Workers build prefabricated houses on the play ground of the middle school of Taiping Village in Lushan County of Ya'an City, southwest China's Sichuan Province, yesterday. The earthquake hitting Lushan on April 20 has damaged the buildings of 357 schools in Ya'an, disturbing the teaching activities in 329 middle and primary schools. Local people built prefabricated houses for the school children to continue their lessons in recent days. [Photo: Xinhua]