Study for the construction of the motherland

The Great Wall The world-famous Great Wall of China, like a vigorous dragon, twists and turns, crouching on the land of China. The Great Wall, majestic, majestic, is a miracle created by the ancient working people of our country, is the most magnificent construction project in the world, and is unique in human history.

Second, it is unique in the world.

The Great Wall stretches from Shanhaiguan in Hebei Province in the east to Jiayuguan in Gansu Province in the west. It crisscrosses Hebei, Beijing, Shanxi, Inner Mongolia, Ningxia, Shaanxi, Gansu and other seven provinces, municipalities and autonomous regions, zigzag and stretches up to 6,700 kilometers, about 10,000 miles, so it is called the "Great Wall". When people mention the Great Wall, they often associate it with Qin Shi Huang, but in fact, in the Warring States period before Qin, there were many vassal states, such as Yan, Zhao, Wei, Qin, Han, etc., who were building the Great Wall in order to defend each other like vertically.

Later, after Qin Shi Huang unified the "Six Kingdoms" of the Great Slag and Li Dynasty, it took more than ten years to connect the Great Wall built by the vassal states and carry out large-scale expansion, so that it became a majestic and magnificent Great Wall that was thousands of miles long, and it can also be said that it was a major military defense measure after the unification of Qin Shi Huang. However, in many dynasties after the Qin Dynasty, the Great Wall was continuously built until the Ming Dynasty. It can be said that the great project of the Great Wall was finally completed in the late Ming Dynasty, and it formed the scale and appearance of the Great Wall today.

The most prominent feature of the Great Wall is: through the high mountains, across the desert, through the grassland, through the cliffs, with the twists and turns of the mountains and the construction of the steep and rugged pass, because of the terrain pass steep and grandiose, like a flying oriental dragon. In this 10,000-mile-long Great Wall, countless arrow towers, beacon piers, passes, and square cities must be built at intervals.

There are also many two-story fortresses built on the city wall, the top of the upper floor is a platform, and there are battlements and lookout holes around it, which is convenient for lookout and attack, and there are small brick rooms on the lower floor, which can live for soldiers and reserve food and weapons. On the commanding heights between the mountains inside and outside the Great Wall, there are many beacon towers. This is set up for the purpose of transmitting military information, whenever the enemy comes to attack, the wolf smoke is lit on the beacon during the day, and the ** seed is lit at night, so that it can be passed down one by one, even if it is thousands of miles away, the news can be quickly transmitted to the capital.

Another feature of the Great Wall is that it is built at about every 10 kilometers. The size of the pass is determined by the degree of danger and military importance of the terrain. Among them, the famous customs cities include Shanhaiguan, Juyongguan, Badaling, Yanmen Pass, Jiayuguan and so on.

For example, Juyong Pass is built in the northwest of Beijing 50 kilometers place, it is built in a long 20 kilometers in the deep mountain valley, the terrain is very dangerous, there is a great momentum of "one husband is the pass, ten thousand people do not open", it is the northwest gateway of ancient Beijing, the location is very important.