名词
中文翻译：城市护城河
同义词：
['city wall', 'moat', 'moat例句：1. The city moat was filled with water to protect the city from invaders.（这个城市的护城河被填满了水，用来保护城市免受入侵者的威胁。）']
例句：
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1. The city moat was filled with water to protect the city from invaders.
这个城市的护城河被填满了水，用来保护城市免受入侵者的威胁。
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2. The ancient city moat is still visible in some parts of the city.
古城墙在某些地方仍然可见。
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3.The moat was a crucial part of the fortification system used by the ancient city.
护城河是古代城市防御系统的重要组成部分。