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 vallum around its walls.
这个古城的城墙上有一个深壕。
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2.In medieval times, vallums were used to protect castles from attackers.
中世纪时期，壕沟被用来保护城堡免受攻击者的攻击。
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3.The vallum was filled with water during the flood season.
洪水季节，护城河里填满了水。