名词
中文翻译：原始人
同义词：
['primitive man', 'ancestor', 'caveman']
例句：
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1. The discovery of the lost city has sparked a renewed interest in ancient civilizations.
发现失落的城市激发了对古代文明的重新兴趣。
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2. The primitive man was forced to adapt to the harsh environment.
原始人被迫适应恶劣的环境。
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3. The caveman's survival skills were honed through years of hunting and gathering.
洞穴人的生存技能是通过多年的狩猎和采集磨练出来的。