Photo taken on Feb. 23, 2016 shows scenery of the sea of clouds at Mountain Huangshan scenic area in Huangshan City, east China's Anhui Province. (Xinhua/Shi Guangde)

Photo taken on Feb. 23, 2016 shows scenery of the sea of clouds at Mountain Huangshan scenic area in Huangshan City, east China's Anhui Province. (Xinhua/Shi Guangde)

Photo taken on Feb. 23, 2016 shows scenery of the sea of clouds at Mountain Huangshan scenic area in Huangshan City, east China's Anhui Province. (Xinhua/Shi Guangde)

Photo taken on Feb. 23, 2016 shows scenery of the sea of clouds at Mountain Huangshan scenic area in Huangshan City, east China's Anhui Province. (Xinhua/Shi Guangde)

Photo taken on Feb. 23, 2016 shows scenery of the sea of clouds at Mountain Huangshan scenic area in Huangshan City, east China's Anhui Province. (Xinhua/Shi Guangde)

Photo taken on Feb. 23, 2016 shows scenery of the sea of clouds at Mountain Huangshan scenic area in Huangshan City, east China's Anhui Province. (Xinhua/Shi Guangde)

Photo taken on Feb. 23, 2016 shows scenery of the sea of clouds at Mountain Huangshan scenic area in Huangshan City, east China's Anhui Province. (Xinhua/Shi Guangde)

Photo taken on Feb. 23, 2016 shows scenery of the sea of clouds at Mountain Huangshan scenic area in Huangshan City, east China's Anhui Province. (Xinhua/Shi Guangde)

Photo taken on Feb. 23, 2016 shows scenery of the sea of clouds at Mountain Huangshan scenic area in Huangshan City, east China's Anhui Province. (Xinhua/Shi Guangde)

Photo taken on Feb. 23, 2016 shows scenery of the sea of clouds at Mountain Huangshan scenic area in Huangshan City, east China's Anhui Province. (Xinhua/Shi Guangde)

Photo taken on Feb. 23, 2016 shows scenery of the sea of clouds at Mountain Huangshan scenic area in Huangshan City, east China's Anhui Province. (Xinhua/Shi Guangde)

Photo taken on Feb. 23, 2016 shows scenery of the sea of clouds at Mountain Huangshan scenic area in Huangshan City, east China's Anhui Province. (Xinhua/Shi Guangde)

Photo taken on Feb. 23, 2016 shows scenery of the sea of clouds at Mountain Huangshan scenic area in Huangshan City, east China's Anhui Province. (Xinhua/Shi Guangde)

Photo taken on Feb. 23, 2016 shows scenery of the sea of clouds at Mountain Huangshan scenic area in Huangshan City, east China's Anhui Province. (Xinhua/Shi Guangde)

Photo taken on Feb. 23, 2016 shows scenery of the sea of clouds at Mountain Huangshan scenic area in Huangshan City, east China's Anhui Province. (Xinhua/Shi Guangde)