brother（弟弟或哥哥） ,sister （妹妹或姐姐），怎么区别？
brother，sister 两个单词表示四种身份（哥哥弟弟姐姐妹妹），如果大家在谈话中怎么知道对方说的是哥哥还是弟弟。或者怎么知道对方说的是姐姐还是妹妹。

Question

brother（弟弟或哥哥）  ,sister （妹妹或姐姐），怎么区别？
brother，sister 两个单词表示四种身份（哥哥 弟弟 姐姐 妹妹），如果大家在谈话中怎么知道对方说的是哥哥还是弟弟 。或者怎么知道对方说的是姐姐还是妹妹。

Answer

There's no distinction in English. You can either add "elder" or "younger"/"little" to the word to indicate who you're talking about. So for example: My elder brother （哥哥） was fighting with my younger sister （妹妹）.

哥哥 = elder brother
弟弟 = younger brother / little brother
姐姐 = elder sister
妹妹 = younger sister / little sister

Answer

older brother is used more often in US.

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