"双刃剑" 的英文表达为 "double-edged sword"。
来源：这个说法源自古希腊神话中的"双刃剑"，它有着锋利的双面刀刃，既可以用来攻击敌人，也可以自己伤害自己。
例句1: The new technology is a double-edged sword, it can bring great benefits but also pose serious risks. (新科技是一把双刃剑，它可以带来巨大的好处，但也可能带来严重的风险。)
例句2: Having too much money can be a double-edged sword, it can make you happy, but it can also bring a lot of stress. (有太多钱是一把双刃剑，它可以让你快乐，但也可能带来很多压力。)