We focus on one because we are paying for it, but the wall is doing the opposite.

我们只关注某一边因为我们只对这一边施力,但是墙对另一边有反向的作用力

耶鲁公开课 - 基础物理课程节选

They face in the opposite direction and you could predict the properties of one from base pairing rules of the other but they're not the same.

它们是反向的,尽管你能够通过一条链上的碱基序列,预测另一条链的序列,但这两条链是不同的

耶鲁公开课 - 生物医学工程探索课程节选

A negative covariance means that they tend to move opposite each other.

负值的协方差就表示,二者反向变动

耶鲁公开课 - 金融市场课程节选