Photo taken on Sept. 7, 2018 shows the autumn scenery along the Yarlung Zangbo River in southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

Photo taken on Sept. 7, 2018 shows the autumn scenery along the Yarlung Zangbo River in southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

Photo taken on Sept. 7, 2018 shows the autumn scenery along the Yarlung Zangbo River in southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

Photo taken on Sept. 7, 2018 shows the autumn scenery along the Yarlung Zangbo River in southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

Photo taken on Sept. 7, 2018 shows the autumn scenery along the Yarlung Zangbo River in southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

Photo taken on Sept. 7, 2018 shows the autumn scenery along the Yarlung Zangbo River in southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

A tourist takes photos of the autumn scenery by the Yarlung Zangbo River in southwest China's Tibet Autonomous Region, Sept. 7, 2018. (Xinhua/Purbu Zhaxi)

Photo taken on Sept. 7, 2018 shows the autumn scenery along the Yarlung Zangbo River in southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)