When the wave of speed of a cutter is decreased, the working accuracy of the crank-shaper, the life expectance of the cutter and the smoothness of the working surface can thus be increased.
减小刀具速度波动，可以提高牛头刨的加工精度、表面光洁度及刀具的寿命。
Result After the treatment, the patients' clinical symptoms were relieved. Average post-operational life-expectance wa directly related to the way of intervention and affected by multiple factors.
结果介入治疗后的患者临床症状明显改善，术后平均存活期与介入治疗的方法有直接关系，并受综合因素的影响。
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