求翻译：中国的万里长城是人类文明史上最伟大的建筑工程，好多年前，中国的长城便已被称为中古世界七大奇迹之一。它始建於春秋战国时期，秦朝统一中国之后建成万里长城。后经历代王朝陆续修筑，汉、明两代修筑的规模更大得惊人，现存的长城为明朝所修筑由渤海之山海关伸展到甘肃省之嘉峪关，长城平均高度为7.8米，平均底部阔6.5米，而顶部为5.8米。它每隔100米便设一座长方形石台作为了望之用。是什么意思？

Great Wall of China is the history of human civilization's greatest construction projects, many years ago, the Great Wall of China is already one of the seven wonders of the world known as the Middle Ages. It was founded in Spring and Autumn Period, the Qin Dynasty unified China after the completion

The Great Wall of China's 10,000 history of human civilization is one of the greatest construction projects, many years ago, the Great Wall of China is now known as medieval world 7 wonders of the. It was constructed in the Spring and Autumn and the Warring States period, Qin dynasty unified China G

China's Great Wall is in the human history of civilization the greatest architectural engineering, many years ago, China's Great Wall has then been called one of Middle Ages world seven wonders of the world.Its beginning constructs at the Spring and Autumn Period Warring States time, after the qin d

The great wall of China is the greatest building projects in the history of human civilization, many years ago, the great wall of China it has been called one of the seven wonders of the medieval world. It was founded in the spring and autumn and warring States period, after the Qin dynasty unified

The great wall of China is the greatest building projects in the history of human civilization, many years ago, the great wall of China it has been called one of the seven wonders of the medieval world. Established spring and Autumn period Qin unified China great wall built after. After the ancient