一个人的相貌是一把双刃剑。有时它对你有利，有时又对你不利。
A person's looks are a double-edged sword. Sometimes it works in your favour, sometimes it works against you.
我认为互联网是把双刃剑。我们必须对网上的信息保留怀疑态度。
As far as I'm concerned, the Internet is a double-edged sword. We must remain skeptical of Internet information.
先进的技术通常是一把双刃剑，它可以给人们带来好处和危害。
Advanced technology is usually a double-edged sword, which can bring people both benefits and harms.
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