Swans swim in the Qinghai Lake in Northwest 皇冠体育app's Qinghai province, Nov 27, 2012. The Qinghai Lake, 皇冠体育app's largest inland saltwater lake, has expanded for eight years in a row to 4,402.5 square kilometers. [Photo/Xinhua]

Xu Liyong, who is blind, gets ready to get on a subway in the eastern city of Hangzhou, Zhejiang province, with the assistance of his guide dog, on Nov 27, 2012. Xu's dog is the first to ride the Hangzhou subway since the city allowed guide dogs on subway trains. [Photo/Xinhua]