达到共赢英语

win-win [win] adj. 双赢的；互利互惠的

Win-win situation to reach the six-party

携手共进 合作共赢翻译成英文是：We will work together for win-win cooperation相关单词学习：cooperation 英[kəʊˌɒpəˈreɪʃn] 美[koˌɑpəˈreʃən] n. 合作; 协作; 配合; 协助; [例句]The meeting discussed how to promote cooperation between the two countries.会议讨论了如何促进两国的合作。[其他] 复数：cooperations

不太明白楼主的补充提问，是说答案是 a ... situation 吗？我会翻译为：an all-win situation for the 6 parties

mutual victory

a situation which bebefits for six parts 有待考证。。。a six-win situation是中式英语，语法没错。