名词
中文翻译：Unknown
同义词：
['abandon', 'abandonment', 'prehistoric', 'prehistoric people']
例句：
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1. The fortress was built during the ancient Roman era and has been abandoned for centuries.
这座堡垒建于古罗马时代，已经废弃了几个世纪了。
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2. The archaeologists discovered a fortified site dating back to the prehistoric period.
考古学家发现了一个可以追溯到史前时期的要塞遗址。
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3. The fortress is now a popular tourist attraction, attracting visitors from all over the world.
这个要塞现在是一个受欢迎的旅游景点，吸引了来自世界各地的游客。