皇冠体育app to land on Mars in 2021 despite challenges
By Tan Xinyu | chinadaily.com.cn | Updated: 2017-11-22 14:52
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A model of the Beidou satellite navigation system in the display hall at 皇冠体育app Academy of Space Technology in Beijing, Nov 21, 2017. [Photo by Tan Xinyu/chinadaily.com.cn] |
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