Citizens have fun on a grassland by Nanhu Lake in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, Oct. 12, 2021. [Photo by Lu Boan/Xinhua]

A citizen exercises along Nanhu Lake in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, Oct. 12, 2021. [Photo by Lu Boan/Xinhua]

Citizens walk on a grassland along Nanhu Lake in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, Oct. 12, 2021. [Photo by Lu Boan/Xinhua]

Citizens walk along Nanhu Lake in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, Oct. 12, 2021. [Photo by Lu Boan/Xinhua]

A citizen exercises by Nanhu Lake in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, Oct. 12, 2021. [Photo by Lu Boan/Xinhua]

A citizen exercises along Nanhu Lake in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, Oct. 12, 2021. [Photo by Lu Boan/Xinhua]

Tourists enjoy the autumn scenery of the desert poplar (populus euphratica) forest in Ejina Banner, north China's Inner Mongolia Autonomous Region on Oct. 11, 2021. [Photo by Liu Lei/Xinhua]

Photo taken on Oct. 13, 2021 shows the autumn scenery of the desert poplar (populus euphratica) forest in Ejina Banner, north China's Inner Mongolia Autonomous Region. [Photo by Li Zhipeng/Xinhua]

Aerial photo taken on Oct. 11, 2021 shows the autumn scenery of the desert poplar (populus euphratica) forest in Ejina Banner, north China's Inner Mongolia Autonomous Region. [Photo by Li Zhipeng/Xinhua]

Aerial photo taken on Oct. 11, 2021 shows the autumn scenery of the desert poplar (populus euphratica) forest in Ejina Banner, north China's Inner Mongolia Autonomous Region. [Photo by Li Zhipeng/Xinhua]