名词
中文翻译：护城河
同义词：
['moat', 'moat', 'moat']
例句：
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1. The ancient city had a deep moat to protect it from invaders.
这个古城有一道深沟来保护它免受入侵者的威胁。
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2. The engineers wereworking on building a new moat aroundthe castle.
工程师们正在为城堡周围修建新的护城河。
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3. Theancient city was surrounded bya moat that protected itfrom attackers.
这个古城被一道护城河包围，用来抵御攻击者。