open marriage
noun [ C ] uk/ˌəʊ.pən ˈmær.ɪdʒ/ us/ˌoʊ.pən ˈmer.ɪdʒ/
开放婚姻(指配偶双方都有发生婚外性关系的自由)
a marriage in which both partners are free to have sexual relationships with other people
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