Two swans have their necks form a shape of "heart" on a lake amid heavy fog at Donghu Park in Guangping County, north China's Hebei Province, Sept. 20, 2012. (Xinhua/Cheng Xuehu)
Swans swim on a lake amid heavy fog at Donghu Park in Guangping County, north China's Hebei Province, Sept. 20, 2012. (Xinhua/Cheng Xuehu)
Swans swim on a lake amid heavy fog at Donghu Park in Guangping County, north China's Hebei Province, Sept. 20, 2012. (Xinhua/Cheng Xuehu)
