sister city
noun [ C ] US uk/ˈsɪs.tə ˌsɪt.i/ us/ˈsɪs.tɚ ˌsɪt̬.i/ (UK twin town)
姐妹城，友好城市
a town or city that shares planned activities and visits with a similar town in another country
Beverly Hills and Acapulco are sister cities. 比弗利山和阿卡普尔科是姐妹城市。