1.sister的意思是“姐,妹”,通常指同胞姐妹,包括同父异母或同母异父的姐妹。
2.在西方,“姐姐”和“妹妹”都叫sister,只有需要特别表明年龄大小时或其他必要情况下,才分为elder sister和younger sister。堂姐妹应说cousin。
3.sister有时还可指“(掌管病房的)护士,护士长”“(修道院的)修女”。
4.在口语中, sister可用于称呼女子; 在正式文体中, sister可用于比喻。

His sister threatened to tell the police, so he had to buy her off.她姐姐威胁要报告警察,于是,他只好花钱收买她。
You must apologize to your sister.你必须向你姐姐道歉。
Don't keep blaming your little sister for your bad behaviour.不要总是把你的不良行为怪在你的小妹妹身上。
After his parents died, responsibility for his three younger sisters bore down upon the young man.父母亲去世后,照顾三个妹妹的重担压在这个年轻人的肩上。
She's a sister on Ward 5.她是5号病房的护士。
The patient was so weak that the sister was unable to get him up.这病人虚弱得很,护士扶都扶不起来。
Sister Mary has disabled herself from walking by a fall.修女玛丽因跌伤不能行走。
French is a sister language of Spanish.法语是西班牙语的姐妹语。
The ships are sisters.这些舰艇是姐妹舰。
Bless you, my sister!祝福你,我的妹妹!
Don't play all day long, sister. 妹妹,别一天到晚玩。
Rally round the flag, sisters, rally round the flag.姐妹们,聚集到旗帜周围,聚集到旗帜周围来。
Hang on, sisters!姐妹们,别泄气!

1.你和姑嫂相处得融洽吗?
［误］  Do your sister-in-laws get along with one another?
［正］  Do your sisters-in-law get along with one another?
［析］  sister-in-law的复数形式为sisters-in-law。
2.哪位护士长负责管理儿童病房?
［误］  Which nurse is in charge of the children's ward?
［正］  Which sister is in charge of the children's ward?
［析］  表示“护士长”可用sister,“护士”可说nurse,也可说sister。
3.那个孤儿院是由一批修女办的。
［误］  The orphanage is run by a group of sister.
［正］  The orphanage is run by a group of sisters.
［析］  “一批修女”可说a group of sisters, sister须用复数形式。

sister用作动词时,可作“像姐妹般对待,(用作称呼)姐妹”。例如:
She is so kind-hearted that she sistered her classmates.她心肠很好,对待同学像姐妹一样。
You shouldn't sister her because she is your teacher.你不应该称她为姐妹,因为她是你的老师。

［词源］  ＜中古英语suster(姐妹)