英文区分姐姐和妹妹：
姐姐 elder sister ，妹妹 younger sister；
同样的，哥哥：elder brother 弟弟：younger brother；
sister
n.(称志同道合者)姐妹;姐;妹;护士长
相关介绍
She used to play games of make-believe with her elder sister.
她过去常跟姐姐玩扮家家的游戏。
She made liberal use of her elder sister's make-up and clothes.
她随便把姐姐的化妆品和衣服拿来用。
Clare's close resemblance to his elder sister invoked a deep dislike in him.
克莱尔酷似他姐姐，这引起他极大的反感。
As a child she fought with her younger sister
她小时候会和妹妹打架。
His sense of guilt had its roots in his childhood loss of his younger sister
他的负疚感源于他在童年失去了妹妹。
She and her younger sister are very close.
她和她妹妹很亲。
