名词
中文翻译：护城河
同义词：
['enclosure', 'moat']
例句：
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1. The castle was surrounded by a large moat.
城堡被一个大护城河包围。
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2. The army had to dig a moat to block the enemy's advance.
军队不得不挖一条壕沟来阻止敌人的前进。
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3. The moat was filled with water to protect the castle from attackers.
护城河被水填满，以保护城堡免受攻击者的攻击。