sister

Janet and Abby are sisters.

珍妮特和阿比是两姐妹。

He has two sisters and a brother.

他有两个姊妹和一个弟弟。

She’s my twin sister .

她是我的孪生妹妹。

the International Monetary Fund and its sister organization, the World Bank.

国际货币基金组织和它的姐妹机构，世界银行。