名词
中文翻译：堡垒
同义词：
['fort', 'stronghold', 'citadel']
例句：
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1. The ancient fortress is still standing today.
这个古老的要塞至今仍然屹立不倒。
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2. They were forced to retreat from the stronghold.
他们被迫从要塞撤退。
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3. The citadel was a symbol of strength and resilience.
这座要塞是力量和韧性的象征。