Photograph by Vera Vernerova , National Geographic - 國家地理雜誌官方網站｜探索自然、科學與文化的最佳權 https://www.natgeomedia.com/history/photo/content-photo-10609-18388.html?utm_source=natgeomedia&utm_medium=photo&utm_content=Share_10609_18388
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Photograph by Vera Vernerova , National Geographic
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