正像人们常常指出的，知识是一把双刃刀，可以用于造福，也可以用来为害。
As is so often pointed out, knowledge is a two-edged weapon which can be used equally for good or evil.
通过切削试验研究了超声激振双刃镗刀镗削深孔的过程和效果，分析了超声激振双刃镗削的切削机理，讨论了切削参数对加工表面粗糙度的影响规律。
Based on the cutting experiment, the process and effect of ultrasonic vibration boring for precise deep holes by using the double-edge boring cutter are researched.
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