The plus or minus 1 comes in because our scale is no more accurate than one gram.

加减一公斤，是因为天平的精度，不能小于1公斤。

youdao

And our equation for total nodes is just the principle quantum number minus 1.

总节点数等于，主量子数减1。

youdao

You may think that the uncertainty in there equals the square root 1 of 372 plus or minus 1 1 divided by 186 plus or minus 1.

你也许认为这个误差,=372加减1的,平方根1,除以186加减。

youdao

And that makes sense, too, because the positive three pulling on minus one has a tighter binding energy than positive one pulling on minus one.

而这也是有意义的，因为+3和-1的相互吸引,产生了比+1和-1的吸引,更强的能量。

麻省理工公开课 - 固态化学导论课程节选

You're not responsible for that, you're not responsible y for correlating +1 to y, minus 1 to x.

你们不需要了解这些，你们不需要,记住+1对应。

麻省理工公开课 - 化学原理课程节选

So if we have total +2 and complete shielding -1 where that can actually negate a full positive charge, because remember our nucleus is plus 2, +1 one of the electrons is minus 1, so if it totally blocks it, all we would have left from the nucleus is an effective charge of plus 1.

抵消一个完全的正电荷,因为记住我们的原子核是,其中一个电子是,所以如果它完全挡住了它，我们从原子核中留下的，全部有效电荷就是，所以，在我们的第一个例子中,我们的第一种极端情况。

麻省理工公开课 - 化学原理课程节选