名词
中文翻译：洞穴人
同义词：
['bushman', 'nomad', 'hunter-gatherer']
例句：
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1.The cave man discovered the first tools made from stone.
洞穴人发现了第一批用石头制成的工具。
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2. His ancestors were nomads who traveled across the desert.
他的祖先是游牧民族，他们穿越沙漠旅行。
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3.Hunter-gatherers used to live off the land and gather food for their families.
狩猎采集者过去靠打猎和收集食物为家庭提供食物。