A scientist displays collected samples of lithobius, in Nagqu of southwest China's Tibet Autonomous Region, July 3, 2017. China began its second scientific expedition to the Qinghai-Tibet Plateau to study changes in climate, biodiversity and environment over the past decades. [Photo/Xinhua]

Scientist Jiang Xuelong checks the holes of rats and rabbits, in Nagqu of southwest China's Tibet Autonomous Region, July 3, 2017. China began its second scientific expedition to the Qinghai-Tibet Plateau to study changes in climate, biodiversity and environment over the past decades. [Photo/Xinhua]

Scientists Li Zhaoguo (R) and Wang Shaoying collect data from a wind radar, in Nagqu of southwest China's Tibet Autonomous Region, July 4, 2017. China began its second scientific expedition to the Qinghai-Tibet Plateau to study changes in climate, biodiversity and environment over the past decades. [Photo/Xinhua]

Aerial photo taken on July 4, 2017 shows the Serling Tso Lake in Nagqu of southwest China's Tibet Autonomous Region. China began its second scientific expedition to the Qinghai-Tibet Plateau to study changes in climate, biodiversity and environment over the past decades. [Photo/Xinhua]

Photo taken on July 4, 2017 shows the base camp of a scientific expedition team in Nagqu of southwest China's Tibet Autonomous Region. China began its second scientific expedition to the Qinghai-Tibet Plateau to study changes in climate, biodiversity and environment over the past decades. [Photo/Xinhua]