Sis
01
姐妹, 妹妹
a female person who has the same parents as another person
02
姐妹, 朋友
a friendly or affectionate term used to address someone
Slang
例子
Sis, you need to calm down and listen.
姐妹，你需要冷静下来听我说。
I ca n't believe you did that, sis!
我不敢相信你竟然那样做了，姐姐！
