Aerial photo taken on Nov. 3, 2020 shows the autumn scenery of forests at Zhihe River in Longyao County, north China's Hebei Province. (Xinhua/Mu Yu)

Aerial photo taken on Nov. 3, 2020 shows the autumn scenery of forests at Zhihe River in Longyao County, north China's Hebei Province. (Xinhua/Mu Yu)

Aerial photo taken on Nov. 3, 2020 shows the autumn scenery of forests at Zhihe River in Longyao County, north China's Hebei Province. (Xinhua/Mu Yu)

Aerial photo taken on Nov. 3, 2020 shows the autumn scenery of forests at Zhihe River in Longyao County, north China's Hebei Province. (Xinhua/Mu Yu)

Aerial photo taken on Nov. 3, 2020 shows the autumn scenery of forests at Zhihe River in Longyao County, north China's Hebei Province. (Xinhua/Mu Yu)

Aerial photo taken on Nov. 3, 2020 shows the autumn scenery of forests at Zhihe River in Longyao County, north China's Hebei Province. (Xinhua/Mu Yu)

Aerial photo taken on Nov. 3, 2020 shows the autumn scenery of forests at Zhihe River in Longyao County, north China's Hebei Province. (Xinhua/Mu Yu)