He has found that humor is a double-edged sword.

他发现幽默是一把双刃剑。

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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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So control of these international highways brought a great deal of wealth to the area, but the central location was a double-edged sword, because in times of peace it would bring prosperity, but, of course, in times of war the land was perpetually invaded as armies would crisscross the land going off to do battle with the great powers.

对这些国际要道的控制,给这个地区带来了大量的财富，但这处于中心的地理位置也如同一把双刃剑，因为在和平时期它带来繁荣，但，在战乱时期，这块土地常常被侵略,当军队在此刀刃相交,或者经过与强国征战。

耶鲁公开课 - 旧约导论课程节选

But for employers, having their staff continually improving their skills is a double-edged sword.

CNN: Rapid rise beckons mobile workers

Metaphors, to use an overused metaphor, are a double-edged sword: sometimes they clarify, sometimes they confuse.

FORBES: When It Comes to Wealth Creation, There Is No Pie

Still, many Chinese and Western economists and demographers say that urbanization can be a double-edged sword.

WSJ: China's Population Shifts to Cities