形容词
中文翻译：Unknown
同义词：
['ancient', 'prehistoric', 'pristine']
例句：
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1. The diluvian period is characterized by the absence of modern technology.
前人类时期的特点是没有现代技术。
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2. The fossils found in the area are evidence of the prediluvian ecosystem.
该地区发现的化石是前人类生态系统的证据。
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3.The prediluvian era was a time of great natural wonders and scientific discoveries.
前人类时代是大自然奇迹和科学发现的时代。