it takes two to tango
一个人不能独自完成某个任务或达成某个目标，需要另外一个人的合作
口语·强调双方责任
英文释义
Both parties involved are responsible for a situation or argument.
例句
Don't blame him alone; it takes two to tango in this argument.
典故来源
源自探戈舞需要两人配合，比喻事件或冲突需双方共同负责。