也可以用箭头，箭头指向,带负电的一极。

Some people like to use an arrow, and the arrow points in the direction of the more electronegative end.

youdao

一种薄膜允许带正电的离子通过，另一种薄膜允许带负电的离子通过。

One passes positively charged ions. The other passes negatively charged ones.

youdao

只是带正负电的区域总面积是大致相当的（差别不超过千百分之一）。

It’s just that the total area of sites with positive and negative charges are roughly equal (the two are typically within a fraction of a percent of each other).

youdao

Some people like to use an arrow, and the arrow points in the direction of the more electronegative end.

也可以用箭头，箭头指向,带负电的一极。

麻省理工公开课 - 固态化学导论课程节选

Now you have this situation where you have a droplet that is net negative or perhaps net positive.

现在的情况是那些液滴,可能是净负电，也可能是净正电。

麻省理工公开课 - 固态化学导论课程节选

So, if we think about the force that occurs between a positively and a negatively charged particle, what we have is essentially a Coulomb force, so we can describe this as a force of attraction.

一个带负电的粒子之间，的作用力,这本质上就是库伦力，我们可以把它，描述成一个引力。

麻省理工公开课 - 化学原理课程节选