Besides, Haitang Bay has an appointment? 13.8? Kilometers of original ecological inland river and? 8? Square kilometers of lagoons and tropical rainforests are also rich in resources, and rare animals and plants reach? 1700? Many kinds of negative oxygen ions in the air are as high as per cubic centimeter? 10000? A. Does the concentration of negative oxygen ions exceed the standard published by the World Health Organization? 10? Second, it can be described as a veritable "natural oxygen bar"