Photo taken with a mobile phone shows fire fighters examining fire fighting equipments in the Palace Museum in Beijing, capital of China, July 10, 2019. (Xinhua/Wu Wenxu)

Photo taken with a mobile phone shows fire fighters examining fire hydrant in the Palace Museum in Beijing, capital of China, July 10, 2019. (Xinhua/Wu Wenxu)

Photo taken with a mobile phone shows fire fighters examining lightening rod in the Palace Museum in Beijing, capital of China, July 10, 2019. (Xinhua/Wu Wenxu)

Photo taken with a mobile phone shows fire fighters examining fire extinguisher in the Palace Museum in Beijing, capital of China, July 10, 2019. (Xinhua/Wu Wenxu)