Xinhua Headlines: Qinghai-Tibet Plateau still one of cleanest regions on earth

          Source: Xinhua| 2018-07-18 20:42:51|Editor: Xiang Bo
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          Xinhua Headlines: Qinghai-Tibet Plateau still one of cleanest regions on earth

          Photo taken on June 21, 2017 shows the scenery in Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province. (Xinhua/Chen Bin)

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          KEY WORDS: Plateau
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