妹妹

sister ship phr. 姊妹船，同型船

baby sister 小妹妹

full sister 亲姐妹

sister school 姊妹校

foster sister phr. 收养的姊妹

older sister 姐姐

sister cities 姐妹城市

sister cell 姐妹细胞

half sister 同父异母姐妹,同母异父姐妹

sister cells 【医】 姊妹