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Using bone for the manufacture of tools and other objects has a long history. Many of the wea that prehi people us for hun were ma from t bones o the ani they hun. The phys properties of these materials varied greatly. For example, the strength and flexibility of antler were important to the way these tools were utilized. Many early bone tools show distinctive signs of wear and polishing, revealing how they were handled and over time.
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参考答案：pons storic ed ting de he f mals ted ical