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.
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