名词
中文翻译：城市城墙
同义词：
['city fortification', 'city wall', 'urban defense']
例句：
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1.The ancient city wall still stands as a testament to its rich history.
古老的城墙依然矗立着，见证了它的丰富历史。
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2. The city wall was built during the Roman era to protect the city from invaders.
这座城墙是在罗马时代建造的，用来保护城市免受侵略者的威胁。
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3.The city wall is an essential part of the historical architecture of the city.
城墙是这座城市历史建筑的重要组成部分。