Polished Stone Implements(磨制石器), 此释义来源于网络辞典。
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They were also beginning to make in addition to the chipped implements of their hunter forbears implements of polished stone.
除了他们那些以狩猎为生的祖先所用过的凿制器具外，他们还慢慢开始制作光滑的石器。
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