“居间促成”可以翻译为 “mediate and facilitate” 或 “act as an intermediary to bring about”。
mediate and facilitate：强调居中调解并推动事情达成的意思，较为简洁直接。例如：They mediated and facilitated the negotiation between the two parties.（他们居间促成了双方的谈判。）
act as an intermediary to bring about：更详细地描述了作为中间人来促成某事的过程， “act as an intermediary” 明确指出充当中间人的角色，“to bring about” 表示实现、促成。例如：He acted as an intermediary to bring about the business deal.（他居间促成了这笔生意。）