手机被称为“双刃剑”，用英语表示就是 "double-edged sword"。来源是源于双刃剑本身的特性，即它有着锋利的两面，同时也有着危险和有益的两面。
例句：
"The internet is a double-edged sword, it can be both a great source of information and a dangerous source of misinformation." (网络是一把双刃剑，它既可以是信息的重要来源，也可能是危险的错误信息来源。)
"Technology is a double-edged sword, it can make our pves easier, but it can also lead to addiction and disconnection." (技术是一把双刃剑，它可以让我们的生活变得更简单，但也可能导致成瘾和脱离现实。)
"The power of social media is a double-edged sword, it can be used to spread awareness, but it can also be used to spread hate." (社交媒体的力量是一把双刃剑，它可以用来传播觉悟，但也可能被用来传播仇恨。)