Aerial photo taken on June 27, 2021 shows the scenery in Saihanba National Forest Park in Chengde, north China's Hebei Province.

Aerial photo taken on June 27, 2021 shows the scenery in Saihanba National Forest Park in Chengde, north China's Hebei Province.

Aerial photo taken on June 27, 2021 shows the scenery in Saihanba National Forest Park in Chengde, north China's Hebei Province.

Aerial photo taken on June 27, 2021 shows the scenery in Saihanba National Forest Park in Chengde, north China's Hebei Province.

Aerial photo taken on June 27, 2021 shows the scenery in Saihanba National Forest Park in Chengde, north China's Hebei Province.

Aerial photo taken on June 27, 2021 shows the scenery in Saihanba National Forest Park in Chengde, north China's Hebei Province.