The words are based on the Latin words for brother and sister.

VOA: special.2009.09.25

Let's say that you're talking to your younger brother and sister.

假设你正在和弟弟妹妹说话。

It's important 课堂 - SpeakingMax英语口语达人

They call each other "brother" and "sister" and yet they're always talking about love all the time.

他们互称为兄弟姊妹“,而且还一直谈论爱。

耶鲁公开课 - 新约课程节选

He finds it better to say that a brother and sister had sex together than to admit that she had sex with one of the common town boys of Jefferson.

VOA: special.2010.01.10

It would seem that the Elder Brother and his sister were way too optimistic in their assessment of the protected status of the virtuous poet and the protected status of the virgin, the favored role of the poet. Virginity does nothing.

似乎《科玛斯》中哥哥和他的妹妹认为,贞洁的诗人，未失童真的诗人自然会受到保护,的想法太过乐观了，贞洁无能为力。

耶鲁公开课 - 弥尔顿课程节选

In eighteen eighty-six, Maggie Tobin left home for the town of Leadville,Colorado, to join a sister and brother who already lived there.

VOA: special.2010.03.08

Yeah, so for example, you get exposed to-- before there was a vaccine your brother or sister had chickenpox, and so you got exposed to chickenpox naturally through your contact with them.

举个例子来说,如果你生活在这样的环境里,兄弟姐妹们还没接种疫苗就得了水痘,而你通过与他们相接触,在自然情况下接触到了水痘病毒

耶鲁公开课 - 生物医学工程探索课程节选

"And,it is strange that if you hate my brother so much, why would you marry his sister!"

VOA: special.2009.06.27

And this is the brother/sister case.

还是这个兄妹案例。

耶鲁公开课 - 心理学导论课程节选

Her sister and brother were already in school when she was born.

VOA: special.2010.03.14

Now to the extent that this discussion is actually about the virginity of the Second Brother and the Elder Brother's sister, it seems, I think, to border on the ridiculous; but the debate, I think, we have to take seriously.

后来这兄弟俩谈论的对象,转到了自己的妹妹的贞洁的时候，就显得有点愚蠢了;,但我觉得这段辩论应当好好研究。

耶鲁公开课 - 弥尔顿课程节选

He had a younger brother, Abbott Lawrence, and a younger sister,Amy.

VOA: special.2010.07.11