Everything you need to know about Helan: news, reviews, in-depth analysis, opinion and more
Everything you need to know about Helan: news, reviews, in-depth analysis, opinion and more
Yinchuan (China), April 18 (Xinhua-ANI): An unmanned Chinese military drone recently completed its first digital mapping mission near north China's Helan mountain, capturing high-definition imaging data during more than five consecutive hours of aerial photography.
