The tool design,working methods and process fundamentals of the trepanning processing were introduced.It proved that trepanning processing is a more cost-effective and accurate method.
从套孔刀具
设计、加工
法
及套孔工艺
基本要求几

说明,套孔是一种更经济、有效并且精确
深孔加工
法。
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Such spiritual healers may well have developed practical healing skills too, as archaeologists have found ample evidence not only of the use of medicinal plants, but also of surgical procedures such as trepanning and attempts to reset broken bones.
这些精神治疗师很
能也发展出了实际的医疗技能,因为考古学家不仅发现了使用药用植物的大量证据,还发现了诸如环锯术
尝试复位断骨等外科手术的证据。