1、雙刃劍 Double-edged sword。
2、Its a double-edged sword.它(這種技術)實際上是一把雙刃劍。
3、At the very start, athletic sport is a double blade sword.競技體育從一開始,就是一把雙刃劍
4、A metaphor used to refer to something that has both advantages and disadvantages, and positive and negative effects.報復本身就是一把雙刃劍, 你放過他吧。