Reason:
1. The role of the Great Wall in past dynasties not only safeguarded national security, but also safeguarded the culture of China. Because the north is flat and the desert is endless, enemy cavalry can be seen everywhere. Therefore, only this continuous fortification can "limit the feet of flax."
2. The Great Wall has also played an important role in the formation and development of the pluralistic and integrated pattern of the Chinese nation. On the contrary, the construction and defense of the Great Wall and the war in the Great Wall area promoted the extensive integration of the Han nationality in ancient China and a dozen ethnic minorities.
3. For China people, the Great Wall is a symbol of will, courage and strength, symbolizing the great will and strength of the Chinese nation. March of the Volunteers's long-term singing has sublimated the Great Wall into national spirit and consciousness in people's minds, and enhanced the pride, self-confidence and patriotic enthusiasm of the Chinese nation.
4. The Sui and Tang Grand Canal not only promoted the economic and cultural exchanges between the North and the South, but also promoted the development of coastal towns. It also has political and military functions, which strengthens the central government's rule over local areas and consolidates national unity.
5. The cultural heritage along the Grand Canal in Sui and Tang Dynasties still plays a considerable role in water resources development, canal tourism and historical and cultural research. It is not only an important information for us to understand the Grand Canal, but also a cultural landscape and heritage that needs our scientific protection and sustainable inheritance.
6. The Grand Canal is not only the connecting channel between the Maritime Silk Road and the northern countries, but also the main connecting channel between the land Silk Road and the Maritime Silk Road in China, which is not only conducive to the spread of advanced economy and culture in the north to the south around the 5th century, but also conducive to the promotion and radiation of economy and culture in the south of the Yangtze River after the 7th century.
Extended data:
Great Wall resources are mainly distributed in Hebei, Beijing, Tianjin, Shanxi, Shaanxi, Gansu, Inner Mongolia, Heilongjiang, Jilin, Liaoning, Shandong, Henan, Qinghai, Ningxia, Xinjiang and other provinces, autonomous regions and municipalities. Shaanxi Province is the province with the richest resources of the Great Wall in China, with a total length of 1838 km. According to the results of the national Great Wall resources survey conducted by cultural relics and surveying and mapping departments, the total length of the Great Wall in Ming Dynasty was 885 1.8km, and it was more than 1 1,000 km in Qin and Han Dynasties and its early period, and the total length was more than 2 1 1,000 km. 196 1 On March 4th, the Great Wall was announced by the State Council as the first batch of national key cultural relics protection units. 1987 65438+February, the Great Wall was listed as a world cultural heritage.
Canal is an artificial waterway used to communicate water transport between regions or waters, and is usually connected with natural waterways or other canals. Besides shipping, canals can also be used for irrigation, flood diversion, drainage and water supply. China has a long history of building canals, which were dug in Sugagawa in 506 BC. It is the oldest artificial canal in the world and the earliest recorded canal in China.
The Beijing-Hangzhou Canal is the longest canal in the world, a great water conservancy construction project created by the Han working people in ancient China, and the earliest and largest canal in the world. After dredging in Yuan Dynasty, it further reached Beijing, with a total length of 1794 km. There are canals connecting the Mississippi River, Hudson River and the Great Lakes (Lake Superior, Lake Michigan, Lake Huron, Lake Erie and Lake Ontario).
References:
? Baidu Encyclopedia-Great Wall?
Baidu encyclopedia-canal