s-i-l

sister of one's sister in law 姻姐妹

sister ship phr. 姊妹船，同型船

baby sister 小妹妹

full sister 亲姐妹

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

sister block 复滑车

Sister Anne 忠实的女伴

sister nation 【法】 姐妹国家