名词
中文翻译：堡垒
同义词：
['castle', 'fortress', 'stronghold']
例句：
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1. The donjon is the tallest building in the area.
这座城堡是该地区最高的建筑。
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2. The king's donjon was a symbol of his power and authority.
国王的城堡象征着他的权力和权威。
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3. The donjon was surrounded by a moat and walls to protect it from attackers.
城堡周围有护城河和城墙，以保护它免受攻击者的攻击。