Despite the envy Iranian leaders may feel towards Turkey's growing regional influence, Tehran continues to view Turkey as an overall positive force.

VOA: standard.2010.07.26

The positive force of attraction of the electrons on the outside is greater and greater, and that pulls everything in.

所以对外层电子的吸引力,会越来越强，把电子们都向内吸引。

麻省理工公开课 - 固态化学导论课程节选

It's a positive force, and it exerts an actual and somehow palpable, discernible force in the world.

它是一种积极的力量，它在世界上发挥一种实际的，某种可感知可识别的作用。

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So, when we get really close together, granted, there is a net positive negative charge with a Coulombic force of attraction.

当它们真正离得很近时，假设有一个带正负电的电荷,带有库仑引力。

麻省理工公开课 - 固态化学导论课程节选

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

It says, if you pull it to the right, so that x is positive, the spring will exert a force which is in the negative direction; that's why you have a minus sign.

就是说,如果你向右拉,x 取正值,弹簧产生的力方向为负,这就是这里用负号的原因

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And so, there is an attractive force between the two of them, the positive and the negative.

因此这两个正负电荷间，存在一个吸引力。

麻省理工公开课 - 固态化学导论课程节选

And shielding is a little bit of a misnomer because it's not actually that's the electron's blocking the charge from another electron, it's more like you're canceling out a positive attractive force with a negative repulsive force.

屏蔽有一点点用词不当,因为它事实上不是,电子阻挡了来自另一个电子的电荷,它更像你在用一个负排斥力，抵消一个正吸引力,但是屏蔽是考虑这个问题,的很好的方式。

麻省理工公开课 - 化学原理课程节选

So, shielding happens when you have more than one electron in an atom, and the reason that it's happening is because you're actually canceling out some of that positive charge from the nucleus or that attractive force with a repulsive force between two electrons.

所以当你们在原子中有多于一个电子,屏蔽就会发生，它之所以会发生的原因是,你们实际上抵消了,一些来自原子核的正电荷,或者来自吸引力,在两个电子之间。

麻省理工公开课 - 化学原理课程节选