用英语介绍的长城(要短文)并翻译

Great Wall of China
The Great Wall of China stretches about 2400 km along China's northern border. In 2000 years B.C the Qin dynasty constructed the fortifications to protect China against the Mongols. Parts of the Ming walls, including this section near Beijing, have been restored in the 20th century
中国长城在中国北方边界延申2400(12000里）公里。在公元2000年前秦朝为了保护中国不受蒙古人的侵犯而建造的防御工事。明城墙的部分(包括在北京的一部分)一直保存到20世纪

A：长城有多少年的历史了？
How long is the history of the Great Wall?
B：大约有两千年多年了，长城是春秋战国时期修建的。这段八达岭长城是明代又重修的，到如今也有四五百年了。
About 2000 years. The Great Wall was built in the period of the Spring and Aut...