So, what we're looking at here is the force when we have two charged particles, one positive one negative -- here, the nucleus and an electron.

我们现在研究的是,一正一负俩个带电粒子之间的,作用力-在这里。

麻省理工公开课 - 化学原理课程节选

And pessimists might be those who say, "No, no. On balance, " the negative of death outweighs the positive-ness of life."

而悲观主义者可能会说，“不，不，总的来说，死亡的负面性要盖过生命的积极性“

耶鲁公开课 - 死亡课程节选