Postgraduates who are about to set out on their obligation as assisting tutors to Gansu Province pose for a group photo in Guiyang, southwest China's Guizhou Province, August 25, 2009. A total of 644 postgraduate volunteers from some 79 universities and colleges across the country have finished their intensive training at Guizhou University and are heading for the less developed middle and western regions to engage in one-year obligatory tutorship. [Xinhua]

Postgraduates who are about to set out on their obligation as assisting tutors take the oaths during the setting-off ceremony in Guiyang, southwest China's Guizhou Province, August 25, 2009. [Xinhua]