用英语介绍长城5句话 1. The Great Wall is a series of fortifications built across northern China over 2,000 years ago. 2. At over 13,000 miles long, it is the longest wall in the world and one of the seven wonders of the medieval world. 3. Its purpose was to protect the Chinese empire from invasions and raids by various nomadic groups. 4. The Great Wall is made up of various materials, including stone, brick, tamped earth, and more modern materials such as concrete and steel. 5. Today, the Great Wall is a popular tourist destination and a symbol of China's rich history and culture. 本文来源：https://www.wddqw.com/doc/f8f6205f598102d276a20029bd64783e09127dac.html