寫作思路：簡單的介紹下長城的特色，包括長城的歷史和長度等知識。
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.?
長城是中國也是世界上修建時間最長、工程量最大的壹項古代防禦工程，延續不斷修築了2000多年。
It is distributed on vast land in northern and central China, with a total length of more than 50,000 kilometers.
長城分布於中國北部和中部的廣大土地上，總計長度達5萬多千米。