World heritage expert goes to ice cave
By Sun Ruisheng | chinadaily.com.cn | Updated: 2017-04-27 17:16
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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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