Students let go balloons during their coming-of-age ceremony at Bayi Middle School in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, May 7, 2013. More than 800 senior high school students in Bayi Middle School attended their coming-of-age ceremony on Tuesday. (Xinhua/Jiang Wenyao)

A boy and his father participate in activities during their coming-of-age ceremony at Bayi Middle School in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, May 7, 2013. More than 800 senior high school students in Bayi Middle School attended their coming-of-age ceremony on Tuesday. (Xinhua/Jiang Wenyao)

Students and their parents participate in activities during their coming-of-age ceremony at Bayi Middle School in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, May 7, 2013. More than 800 senior high school students in Bayi Middle School attended their coming-of-age ceremony on Tuesday. (Xinhua/Jiang Wenyao)

Students cheer for their coming-of-age ceremony at Bayi Middle School in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, May 7, 2013. More than 800 senior high school students in Bayi Middle School attended their coming-of-age ceremony on Tuesday. (Xinhua/Jiang Wenyao)