Try reading like this: 战国 时期 的 中国 长城 是 诸侯 之间 的 相互 防御 墙， 空间 很 小，相对 缺乏 连续性。 朱淮 国王 在 30 年 前 建造了 中国的 长城， 当时 它 被 称为 防城。 在 楚国 首都， 曾经 用来 防御 邻国 的 袭击。

战国时期的中国长城是诸侯之间的相互防御墙，In China's Age of Warring States, the Great Wall is just a cooperative defensive wall amongst the various dukedoms, 空间很小， the distance is limited 相对缺乏连续性。on the contrary, there is no connectivity 朱淮国王在30年前建造了中国的长城，During the thirty years under the rule of 朱淮, there is already a long wall built 当时它被称为防城。At that time, it was known as the defensive city wall. 在楚国首都，At the capital city of State Chu, 曾经用来防御邻国的袭击, it was once used as a defense against neighboring dukedoms from attack. 城 means city wall and eventually comes to mean the city itself. A 郭 is an additional wall that surrounds the outer city. 萬里長城 literally means 10,000 miles long city wall.

放弃吧，这段中文写的不怎么样。