soulmate
noun [ C ] uk/ˈsəʊl.meɪt/ us/ˈsoʊl.meɪt/
知音，知己；心心相印的伴侣
someone, usually your romantic or sexual partner, who you have a special relationship with, and who you know and love very much
Later that year she met Adam and she knew instantly that they were soulmates. 那一年末，她遇到了亚当，立刻感到他们就是知音。