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。