南京城墙据说是世界上最长的城墙。
The Nanjing city wall is believed to be the longest city wall in the world.
本文主要论述了明代南京城墙砖铭文的相关问题。
This paper has a discussion on the inscriptions on the bricks of the city wall of Nanjing in Ming dynasty.
中华门是南京城墙上最大的一座城门，也是世界建城史上最大的瓮城。
The Zhonghua Gate is the biggest gate in the wall, and it is also the biggest in the world.
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