Fossilized dinosaur footprints at Yanqing Geopark in Beijing, Oct. 15, 2018. Experts from the Petrified Forest of Lesbos in Greece, China University of Geosciences (Beijing) and Yanqing Geopark are launching a new round of experimental conservation efforts for the dinosaur footprints formed about 150 million years ago and now suffering from erosion and weathering. (Photo/Xinhua)
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