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

Unfortunately, weight loss diets don't work very well, and that's one of the reasons why there is always a diet book on the best-seller list.

很不幸,食品减肥的作用不明显,正因为如此,最畅销书榜才总有减肥食品的书上榜

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

So, an electron has a charge of negative e, we've written here and the nucleus has a charge of positive e.

我们写在这，原子核带正e的电荷,我们看到作用力。

麻省理工公开课 - 化学原理课程节选