The Great Wall of China the longest wall in the w

问题补充：

The Great Wall of China ,the longest wall in the wor ld,runs across north china like a huge dragon请帮忙翻译上面得句子,翻译中文得句子怎样安排顺序更通顺.across 是穿过的意思,有加一个run该怎么解释?

答案：

中国的长城是世界上最长的墙,它像一条巨龙横贯中国北方.

across是穿过的意思

run across可以译为：横贯