Introduction to the mottled ancient city wall: Looking at the Great West Gate from a distance, the gate tower is tall and broad, majestic and extraordinary. But when you look closely at the outer wall of the city gate, you can see that the wall is mottled and peeling off, and there are many cracks in the door bricks. In recent years, many experts have come from the outside world to conduct measurements and studies on the condition of the city wall in order to propose corresponding measures for the protection of the city wall.

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