Aerial photo taken on Aug. 22, 2021 shows the scenery of Saihanba forest farm in north China's Hebei Province. (Xinhua/Mu Yu)

Aerial photo taken on Aug. 23, 2021 shows the scenery of Saihanba forest farm in north China's Hebei Province. (Xinhua/Mu Yu)

Aerial photo taken on Aug. 22, 2021 shows the scenery of Saihanba forest farm in north China's Hebei Province. (Xinhua/Jin Haoyuan)

Aerial photo taken on Aug. 23, 2021 shows the scenery of Saihanba forest farm in north China's Hebei Province. (Xinhua/Mu Yu)

Aerial photo taken on Aug. 22, 2021 shows the scenery of Saihanba forest farm in north China's Hebei Province. (Xinhua/Mu Yu)

Aerial photo taken on Aug. 22, 2021 shows the scenery of Saihanba forest farm in north China's Hebei Province. (Xinhua/Mu Yu)

Aerial photo taken on Aug. 22, 2021 shows the scenery of Saihanba forest farm in north China's Hebei Province. (Xinhua/Mu Yu)

Aerial photo taken on Aug. 23, 2021 shows the scenery of Saihanba forest farm in north China's Hebei Province. (Xinhua/Mu Yu)

Aerial photo taken on Aug. 22, 2021 shows the scenery of Saihanba forest farm in north China's Hebei Province. (Xinhua/Mu Yu)

Aerial photo taken on Aug. 23, 2021 shows the scenery of Saihanba forest farm in north China's Hebei Province. (Xinhua/Mu Yu)

来源：Xinhua