Visitors watch fish at the Polar Aquarium in Tianjin, north China, Aug. 1, 2015. Visitors can spend the night at the aquarium, observing nocturnal behaviors of marine creatures. (Xinhua/Li Xiang)
Visitors watch fish at the Polar Aquarium in Tianjin, north China, Aug. 1, 2015. Visitors can spend the night at the aquarium, observing nocturnal behaviors of marine creatures. (Xinhua/Li Xiang)