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possessive + sister
指有相同父母的女性兄弟姐妹，可用姐姐或妹妹。
My sister is a doctor.
我姐姐是医生。
姐妹
sisters — plural of sister
先理解核心含义，再看它在真实句子里的用法。
姐妹
a female person who has the same parents as another person
My sister is a doctor.
我姐姐是医生。
同父母的女儿；女性兄弟姐妹。
A daughter of the same parents as another person; a female sibling.
对宗教团体成年女性成员的尊称。
Title of respect for an adult female member of a religious order.
宗教团体的女性成员；尤指从事更积极服务者；(非正式)修女。
A female member of a religious order; especially one devoted to more active service; (informal) a nun.
对兄弟/姐妹组织成年女性成员、运动中的同志,甚至使用虚拟亲属关系的陌生人的尊称。
Title of respect for an adult female member of a fraternal/sororal organization, or comrade in a movement, or even a stranger using fictive kin.
My sister is two years younger than me, and she loves playing the piano.
我妹妹比我小两岁，她喜欢弹钢琴。
I am going to visit my sister in Shanghai next weekend.
下周末我要去上海看望我姐姐。
The two sisters are opening a small bakery together.
这对姐妹要一起开一家小面包店。
指有相同父母的女性兄弟姐妹，可用姐姐或妹妹。
My sister is a doctor.
我姐姐是医生。
作为修女的称呼，Sister须大写。
Sister Mary is the principal.
玛丽修女是校长。
指同一组织或团体的女性成员。
She is a sister in the sorority.
她是姐妹会中的一位姐妹。
Not this
Sister is a doctor.
Use this
My sister is a doctor.
在英语中，表示亲属关系时通常需要加上所有格代词（如my, your等），否则句子不完整或含义不清。
Not this
She is my sister, not by blood but by heart.
Use this
She is like a sister to me.
在英语中，'sister'通常指有血缘关系的姐妹或修女、女会员等。用比喻意为‘像姐妹一样’时，常用'like a sister'结构，直接使用'sister'会造成误解。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
姐姐
My older sister is a teacher.
我的姐姐是一名教师。
妹妹
My younger sister loves to dance.
我的妹妹喜欢跳舞。
小妹妹
My little sister is only five years old.
我的小妹妹只有五岁。
大姐姐
She is like a big sister to me.
她对我来说就像一个大姐姐。
姐妹城市
Our city has a sister city in Japan.
我们城市与日本的一个城市结为姐妹城市。
姐妹船
The Titanic and Olympic were sister ships.
泰坦尼克号和奥林匹克号是姐妹船。
姐妹公司
Our sister company handles the European market.
我们的姐妹公司负责欧洲市场。
姐妹克里斯蒂安，哦，时机已到
Sister Christian, oh the time has come
姐妹克里斯蒂安，哦，时机已到
我们是一家人！我所有的姐妹都和我在一起！
We are family! I got all my sisters with me!
我们是一家人！我所有的姐妹都和我在一起！
Use sisters naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
sis 像‘细丝’，ter 像‘特’；想象姐妹用细丝特别地编织在一起，记住姐妹关系紧密。
作为名词，'sister'有多个义项：姐妹（日常中性）、修女（正式宗教）、女同事（非正式组织）。语域混合。
可数名词，复数形式为sisters。
Dictionary facts from ECDICT, WIKTIONARY.