Because positive psychology may mean that we are only focusing on the positive and what works, ignoring all the rest that are not.

因为积极心理学可能表示,我们只聚焦于积极的起作用的部分，忽略其余不起作用的。

哈佛公开课 - 幸福课课程节选

As you come to the top of the building, the elevator has to decelerate, so that it loses its positive velocity and comes to rest.

当你要到顶时,电梯需要减速,此时电梯速度减小最后静止

耶鲁公开课 - 基础物理课程节选