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A person's looks are a double-edged sword. Sometimes it works in your favour, sometimes it works against you.
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。
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Advanced technology is usually a double-edged sword, which can bring people both benefits and harms.
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。
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As far as I'm concerned, the Internet is a double-edged sword. We must remain skeptical of Internet information.
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。
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Since technology is a double-edged sword, the development it brings and its potential threats are two sides of the same coin.
技术是一把双刃剑,因此它所带来的发展及其潜在威胁是紧密相关的。
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Let us look at an idiom: kill two birds with double-edged sword.
我们再看一个成语:一举两得/一箭双雕。