... 万能硬质合金钻头 Sintered Carbide Drills 冲击钻头 Stone Drill Bit 锤钻钻头 (SDS-plus接口) Hammer Drills SDS plus ...
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stone drill bit
石钻钻头
以上为机器翻译结果,长、整句建议使用 人工翻译 。
But they did see concentric grooves left by what they think was a drill with a tiny stone bit.
BBC: Prehistoric dentistry evidence found
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