Aerial photo taken on Sept. 23, 2020 shows a view of Caka Salt Lake in Wulan County, northwest China's Qinghai Province. Thanks to the Qinghai-Tibet Railway and its extension railways, many tourist attractions in the province have been connected, which significantly promoted the tourism industry here and helped locals increase income. (Xinhua/Zhang Long)

Aerial photo taken on Sept. 23, 2020 shows a hot air balloon by the Qinghai Lake in northwest China's Qinghai Province. Thanks to the Qinghai-Tibet Railway and its extension railways, many tourist attractions in the province have been connected, which significantly promoted the tourism industry here and helped locals increase income. (Xinhua/Zhang Long)

People visit Caka Salt Lake in Wulan County of northwest China's Qinghai Province, Sept. 23, 2020. Thanks to the Qinghai-Tibet Railway and its extension railways, many tourist attractions in the province have been connected, which significantly promoted the tourism industry here and helped locals increase income. (Xinhua/Zhang Long)

Aerial photo taken on Sept. 23, 2020 shows people visiting Qinghai Lake in northwest China's Qinghai Province. Thanks to the Qinghai-Tibet Railway and its extension railways, many tourist attractions in the province have been connected, which significantly promoted the tourism industry here and helped locals increase income. (Xinhua/Zhang Long)

Aerial photo taken on Sept. 22, 2020 shows a village in Wulan County of northwest China's Qinghai Province. Thanks to the Qinghai-Tibet Railway and its extension railways, many tourist attractions in the province have been connected, which significantly promoted the tourism industry here and helped locals increase income. (Xinhua/Zhang Long)

Aerial photo taken on Sept. 23, 2020 shows a view of Caka Salt Lake in Wulan County, northwest China's Qinghai Province. Thanks to the Qinghai-Tibet Railway and its extension railways, many tourist attractions in the province have been connected, which significantly promoted the tourism industry here and helped locals increase income. (Xinhua/Zhang Long)

Aerial photo taken on Sept. 23, 2020 shows a view of Caka Salt Lake in Wulan County, northwest China's Qinghai Province. Thanks to the Qinghai-Tibet Railway and its extension railways, many tourist attractions in the province have been connected, which significantly promoted the tourism industry here and helped locals increase income. (Xinhua/Zhang Long)

People visit Qinghai Lake in northwest China's Qinghai Province, Sept. 23, 2020. Thanks to the Qinghai-Tibet Railway and its extension railways, many tourist attractions in the province have been connected, which significantly promoted the tourism industry here and helped locals increase income. (Xinhua/Zhang Long)

People visit Qinghai Lake in northwest China's Qinghai Province, Sept. 23, 2020. Thanks to the Qinghai-Tibet Railway and its extension railways, many tourist attractions in the province have been connected, which significantly promoted the tourism industry here and helped locals increase income. (Xinhua/Zhang Long)

People visit Qinghai Lake in northwest China's Qinghai Province, Sept. 23, 2020. Thanks to the Qinghai-Tibet Railway and its extension railways, many tourist attractions in the province have been connected, which significantly promoted the tourism industry here and helped locals increase income. (Xinhua/Zhang Long)

People visit Qinghai Lake in northwest China's Qinghai Province, Sept. 23, 2020. Thanks to the Qinghai-Tibet Railway and its extension railways, many tourist attractions in the province have been connected, which significantly promoted the tourism industry here and helped locals increase income. (Xinhua/Zhang Long)

People visit Qinghai Lake in northwest China's Qinghai Province, Sept. 23, 2020. Thanks to the Qinghai-Tibet Railway and its extension railways, many tourist attractions in the province have been connected, which significantly promoted the tourism industry here and helped locals increase income. (Xinhua/Zhang Long)