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Due to the outbreak of COVID-19, Chinese people across the country have been advised to stay at home. With the epidemic situation in China turning positive, some stadiums and gyms with good ventilation can begin to resume operations in areas with a low epidemic risk to meet people's needs for exercise.

Drawing an analogy to legendary Chinese flood control hero Dayu, who contained flooding by means of dredging rather than obstruction, President Xi Jinping said, "The capital's core functions should be preserved and strengthened, and some inappropriate functions adjusted and weakened."

Due to human destruction and natural weathering, some parts of the Great Wall are damaged or have collapsed, and they are in urgent need of renovation.

Due to years of neglect, the central structure of the walls has seen serious damage, while the walls are relatively well preserved. Remains of draining holes and defense platforms have also been discovered at the site.

Dual-layer system