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石(shí )器(qì )时(shí )代(dài )的(de )工(gōng )具(jù ),形(xíng )状(zhuàng )不(bú )固(gù )定(dìng )。将(jiāng )砾(lì )石(shí )或(huò )石(shí )核(hé )边(biān )缘(yuán )打(dǎ )成(chéng )厚(hòu )刃(rèn ),用(yòng )以(yǐ )砍(kǎn )砸(zá )。
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