So, what this means is that when we're looking at an actual wave function, we're treating it as a wave, right, so waves can have both magnitude, but they can also have a direction, so they can be either positive or negative.

这意味着,当我们看一个波函数时,我们把它看做一个波，波不仅有幅值，还有方向，所以它们可正可负，如果。

麻省理工公开课 - 化学原理课程节选

The two analogies we use " was strengthening our immune system or stronger "psychological engine" that has the capacity to endure more not just from the negative to zero, but also from the zero to the positive.

我们使用的两个类比,是加强我们的免役系统或加强“心理引擎“,获得更强大的忍受能力,不只是从负到零，还要从零到正。

哈佛公开课 - 幸福课课程节选

And also we are able to tap into the expertise of professors, not just at the University of Pennsylvania, but also at other schools as well so that we can bring in the very top leading researchers and practitioners of positive psychology.

我们还聘请多位教授，不局限于宾州大学，还有其他大学,我们请来最杰出的研究员,和积极心理学的从业者。

哈佛公开课 - 幸福课课程节选