Students lower their heads during a silent tribute to the victims of Lushan April 20 earthquake, in Lushan Middle School, Ya'an city, Southwest China's Sichuan province on April 27, 2013. [Photo/Xinhua]
Students lower their heads during a silent tribute to the victims of Lushan April 20 earthquake, in Lushan Middle School, Ya'an city, Southwest China's Sichuan province on April 27, 2013. [Photo/Xinhua]