Numeral + Measure Word + 姐妹
The noun 姐妹 (jiěmèi) means "sisters" in Chinese, combining 姐 (older sister) and 妹 (younger sister). It can refer to biological sisters or be used more broadly for close female friends or companions who share a bond.
她们姐妹三个感情特别好。
Tāmen jiěmèi sān gè gǎnqíng tèbié hǎo.
The three sisters have an especially close relationship.
我和她虽然不是亲姐妹,但比亲的还亲。
Wǒ hé tā suīrán bú shì qīn jiěmèi, dàn bǐ qīn de hái qīn.
Although she and I are not biological sisters, we are closer than real sisters.
这对姐妹长得几乎一模一样。
Zhè duì jiěmèi zhǎng de jīhū yìmúyíyàng.
This pair of sisters look almost exactly alike.