A flag-raising ceremony is held at Potala Palace Square, Lhasa, capital city of China's Tibet autonomous region, to celebrate the 58th Serfs Emancipation Day on March 28, 2017. The annual Serfs Emancipation Day is held to commemorate the 1959 democratic reform in Tibet, which ended feudal serfdom and freed about one million Tibetan serfs. [Photo by Da Qiong/chinadaily.com.cn]

Tibetans in native dress attend a ceremony to celebrate the 58th Serfs Emancipation Day in Potala Palace Square, Lhasa, on March 28, 2017. [Photo by Da Qiong/chinadaily.com.cn]

People gather to celebrate the 58th Serfs Emancipation Day at Potala Palace Square, Lhasa, on March 28, 2017. [Photo by Da Qiong/chinadaily.com.cn]

A group of people pose for a picture during the celebration ceremony to mark Serfs Emancipation Day in front of the Potala Palace in Lhasa,on March 28, 2017. [Photo by Da Qiong/chinadaily.com.cn]

Tibetan students attend the celebration ceremony to markthe 58th Serfs Emancipation Day in Potala Palace Square, Lhasa, on March 28, 2017. [Photo by Da Qiong/chinadaily.com.cn]

People attend the ceremony to celebratethe 58th Serfs Emancipation Day in Potala Palace Square, Lhasa, on March 28, 2017. [Photo by Da Qiong/chinadaily.com.cn]