我害怕说永远，它就像一把双刃刀。
互联网是生活的一部分，而不是双刃刀。
The Internet is part of their lives, rather than double-edged sword.
夏普点：残破的玩具可能会暴露危险双刃刀，锋利点。
Sharp points: Broken toys can expose dangerous prongs and knife-sharp points.
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.
解释真正锋利的刀尖和刀刃的价值，后者，尤其对于双刃匕首来说，可以用削划在很大程度上防止对手抓刀。
Explain the value of a really sharp point and edge, the latter, particularly with a double edged knife, being as much to prevent the knife from being seized as for slashing.
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.
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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