It's oriented in the oppose direction and it has the complementary base pairs at each position.

它们方向相反,并且所有的碱基都是互补的

耶鲁公开课 - 生物医学工程探索课程节选

Finally I want to oppose a challenge to you and ask you a question.

最后我想挑战一下你们,给你们留个问题。

麻省理工公开课 - 媒体、教育、市场课程节选