Drops of dew are seen on a grass in a sinkhole in the mountainous Xuanen County in central China's Hubei Province, May 19, 2015. Due to the local Karst landscape and humid climate, a sinkhole more than 290 meters deep in Xuanen has become home for various plants and animals. A full and original eco-system is kept in the hole as it is hard for human to get in. (Xinhua/Song Wen)
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