A I cannot understand why she always helps and supports her brother.
我真不明白她为何总是帮着她的弟弟说话，支持着她弟弟。
B Why do you say so?
为什么这么说？
A Because he is often in trouble.
因为他弟弟总是麻烦不断。
B She has promised her mother that she would be with him through thick and thin.
她答应过自己的母亲，她将和她弟弟同甘共苦。
A Oh, I see.
哦，我明白了。