On the 1-word section of the Great Wall structure

Writing ideas: mainly write the structure of the Great Wall.

Text:

The Great Wall is not just a single wall, but a complete defense engineering system composed of various fortifications, such as the wall, watchtowers, Guancheng, Dunbao, Yingcheng, Weisuo and Zhencheng beacon tower. This defense engineering system is under the command and control of military command systems at all levels.

The wall body is the main part of the city wall, with an average height of 7.8 meters, and some sections are as high as 14 meters. Where the hill is steep, the building is relatively low, and the flat place is relatively high; The critical place is higher, and the general place is lower. The wall body is the main part to defend the enemy, and its total thickness is relatively wide, with a foundation width of 6.5 meters and an average floor width of 5.8 meters on the wall, so as to ensure the parallel running of two wagons.

The wall of the Great Wall is the main part of this defense project. It was built in the steep mountains or plains, and it was built according to the needs of topography and defense function. Where it was built in the plains or key passes, it was very tall and firm, while it was relatively low and narrow in the steep mountains, in order to save manpower and cost, and even some of the most steep places could not be built conveniently, the methods of "mountain wall" and "chopping gable" were adopted.