Aerial photo taken on May 20, 2019 shows the scenery of Taishan Mountain in Tai'an City, east China's Shandong Province. (Xinhua/Guo Xulei)

　　Tourist visit Taishan Mountain in Tai'an City, east China's Shandong Province, May 21, 2019. (Xinhua/Guo Xulei)

　　Tourist visit Taishan Mountain in Tai'an City, east China's Shandong Province, May 20, 2019. (Xinhua/Guo Xulei)

　　Photo taken on May 21, 2019 shows the scenery of Taishan Mountain in Tai'an City, east China's Shandong Province. (Xinhua/Guo Xulei)

　　Photo taken on May 21, 2019 shows the scenery of Taishan Mountain in Tai'an City, east China's Shandong Province. (Xinhua/Guo Xulei)

　　Aerial photo taken on May 20, 2019 shows the scenery of Taishan Mountain in Tai'an City, east China's Shandong Province. (Xinhua/Guo Xulei)

　　A tourist watches sunrise on Taishan Mountain in Tai'an City, east China's Shandong Province, May 21, 2019. (Xinhua/Guo Xulei)

　　Photo taken on May 21, 2019 shows the scenery of Taishan Mountain in Tai'an City, east China's Shandong Province. (Xinhua/Guo Xulei)