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World heritage expert goes to ice cave

By Sun Ruisheng | chinadaily.com.cn | Updated: 2017-04-27 17:16

World heritage expert goes to ice cave

An ice cave stays below freezing despite the arrival of spring in Ningwu county, North China's Shanxi province. The ice cave was formed about 3 million years ago and its temperature stays at -6 Celsius degrees throughout the year. [Photo by Wang Quan / chinadaily.com.cn]

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