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, what we're saying is that we have n equals to 4, and m sub I being equal to negative 2.

我们说的是ｎ等于４,ｍｌ等于－２

麻省理工公开课 - 化学原理课程节选

And if you're below this temperature here, this quantity, p times v it would be negative.

压强与体积的乘积将变成负数，这可能吗？

麻省理工公开课 - 热力学与动力学课程节选

Maybe the central problem with the Obama attacks isn't that they're negative but that they're absurd lies.

WSJ: What's at Stake in Wisconsin

Mr. FRANKEN: We've been running ads about Norm Coleman's record, and so they're negative because his record hasn't been very good.

NPR: In Minn., A Tight Race For U.S. Senate

The negative is you're charging probably poorer borrowers.

NPR: Time for Renovation at the FHA?