将长城是世界一大奇迹。现在每年都有几百万人到长城游览。在旺季几处最著名的景点总是让成群结队的游客挤得水泄不通。中国人修筑城墙的历史久远可以追溯到战国时期。历史上中国共修过大约 20 座长城。在所有这些长城中明长城最长达到 6700 公里。在当时中国技术在世界上处于领先地位因此明长城的结构也是最复杂的。明长城的修筑是为了抵御北方游牧民族的入侵。清朝建立后由于它的建立者本身也是游牧民族他们觉得没有必要

The Great Wall is one of the world's greatest wonders. Every year, millions of people visit the Great Wall. During peak seasons, several famous spots are always crowded with hordes of tourists. The history of the Chinese building walls dates back to the Warring States period. In total, China has built approximately 20 Great Walls throughout history. Among all these walls, the Ming Great Wall is the longest, stretching 6700 kilometers. At that time, Chinese technology was at the forefront in the world, so the structure of the Ming Great Wall was also the most complex. The construction of the Ming Great Wall was aimed at defending against invasions from nomadic tribes in the north. After the establishment of the Qing Dynasty, as its founders were also nomadic tribes, they felt there was no need to continue building the Great Wall. However, the Qing government still issued laws to protect the Great Wall, prohibiting its demolition. Nevertheless, the passage of time and continuous wars caused serious damage to the accessible parts of the wall. Over the past decade, the booming tourism industry has promoted restoration projects of the Great Wall. Currently, many sections of the wall have been repaired or are undergoing renovation.