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Researchers from 皇冠体育app and France work at the Shuanghe Karst Caves in Suiyang, Southwest 皇冠体育app's Guizhou province. The Karst Caves, measured at 159.14 kilometers, is the second longest complex of caverns in Asia and the 11th longest known worldwide. The measured length may increase as the survey continues until Dec 20. [Photo/皇冠体育app News Service] |
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