祖先们在原始时代靠打猎为生。
他们居住于洞中，靠打猎为生，能够使用并制造简单的石器。
They lived in caves and hunted and they could use and make simple stone-made tools.
这些人俗称布须曼人（即丛林人的意思），祖祖辈辈靠打猎和采集为生。
These people, known colloquially as bushmen, traditionally make their livings by hunting and gathering.
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