姐姐的单词：sister、elder sister，两个单词的意思都是姐姐，一般使用sister。
My sister came along just to give me some moral support.
我姐姐只是过来给我一些道义上的支持。
She's never really got on with her sister.
她从未与妹妹真正和睦相处过。
His elder sister is very affectionate towards him.
姐姐待他很有情义。
We all affectionately refer to her as our elder sister.
我们都亲热地称她为大姐。
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