用英文介绍一下The Great Wall

用英文介绍一下The Great Wall

写作思路：简单的介绍下长城的特色，包括长城的历史和长度等知识。

The Great Wall is an ancient defense project with the longest construction time and the largest quantity in the world. It has been continuously constructed for more than 2000 years. 

长城是中国也是世界上修建时间最长、工程量最大的一项古代防御工程，延续不断修筑了2000多年。

It is distributed on vast land in northern and central China, with a total length of more than 50,000 kilometers.

长城分布于中国北部和中部的广大土地上，总计长度达5万多千米。