Tourists climb the Badaling section of the Great Wall as they stay in the sweltering weather in Beijing, capital of China, Aug 5, 2018. [Photo/Xinhua]

Tourists climb the Badaling section of the Great Wall as they stay in the sweltering weather in Beijing, capital of China, Aug 5, 2018. [Photo/Xinhua]

Tourists climb the Badaling section of the Great Wall as they stay in the sweltering weather in Beijing, capital of China, Aug 4, 2018. [Photo/Xinhua]