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So we could think about comparing the potassium ion to a sodium ion. They have the same charge of plus one.
我们可以想象比较一下钾离子,与钠离子，它们都同样带有正一价的电荷。
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Two plus one equaled three before there were people; two plus one equals three now; two plus one will always equal three.
在人类出现之前,二加一就等于三,二加一现在等于三,并将永远等于三
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They start glomming together, but they don't stop with one plus one.
它们开始相互吸引，但是并不以1个吸引1个的形式结束。
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I think you can tell by analogy with what I did in one dimension that the position of that object at any time t is going to be the initial position plus velocity times t plus one half a t square.
你们可以类比一下我在一维情况下的结论,这个物体在任意时刻 t 的位移,等于初始位移,加上 v ? t + 1/2 ? a ? t^2
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And if we put that in our bond here, we have 1, 2, 3 bonds, plus we have one lone pair left over.
如果我们把它们放到键里，我们有1，2，3个键，还剩下一对孤对在这里。
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One hundred fifty plus office hours is the current tally that you'll see starting to appear on the course's website, thanks to our 60 plus person staff and you'll also see online soon once you have your accounts as per problem set 0 spec.
50多个小时的课时,就是你现在在课程网站上要看到的，在这里我们要感谢60多位同仁的帮助,一旦你开通账号，你就可以在线看到了。
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q2 So it's one plus q2.
等于1加。
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If you have an interest rate--this is approximately equal to-- one plus the real interest rate is equal to divided by one plus the rate of inflation.
如果你知道名义利率,那实际利率约等于,这里应该是=,/
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Remember, it's one and a half times inflation rate plus a half time the GDP utilization 1 plus 1.
注意，公式是，1。5倍通货膨胀率,加上0。5倍实际GDP与名义GDP的百分比,再加上恒常数。
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And if I pull it out one more level, 12k it's 12 plus 12 plus t of b over 8, 12 k because I'll have 12 of those to add up, plus t of b over 2 to the k.
总结一下也就是说，在k步以后，总步数应该是，那这种情况什么时候才能停止呢？,才能到达最基本的情况呢？
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One plus one and then an ion pair grabs another one, another one.
加,接下来一对吸引另一对，再一对。
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Cation is plus one, anion is minus one.
阳离子带正电荷，阴离子带负电荷。
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Three plus one equals four, today, yesterday and forever.
加1等于，昨天是今天是永远都是。
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Remember, we don't do a one-to-one correlation, because p x and p y are some linear combination of the m plus 1 and m minus 1 orbital.
记住，我们不需要把它们一一对应，因为ｐｘ和ｐｙ轨道是,ｍ等于正负１轨道的线性组合。
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q1 Or we can write it as one plus q2 over q1.
即1加q2除以。
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I am doing this for plus one minus one like sodium chloride.
我正在这样做,因为就像氯化钠那样一正一负。
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But once in awhile, one of these plus twos comes in almost on axis, and it gets whipped around by the Coulombic repulsive forces.
但是偶尔一个带两个正电荷的粒子,以接近于轴的位置进入，会快速的移动到周围,由于库仑斥力的作用。
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1/2 And we have the spin quantum number 2 as plus 1/2 for electron one, -1/2 and minus 1/2 for the electron two.
我们有自旋量子数,对于电子，我们有自旋量子数。
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So this one is spin-up plus a half, this is spin-down minus a half.
所以自旋向上是正二分之一，而自旋向下是负二分之一。
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So that is one plus against one minus.
因此这是一正对一负。
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No, here both are plus, but this one has a minus.
不对,这里都是加号,但这有个负号
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We know it's going around in a circle because if I find the length of this vector, which is the x-square part, plus the y-square part, I just get r square at all times, because sine square plus cosine square is one.
我们之所以知道它做圆周运动,是因为我求出了这个矢量的模长,也就是 x 的平方加上 y 的平方,我就得到了它在任意时刻的模长平方,因为正弦平方加余弦平方始终等于1
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We all do believe something makes it true that two plus one equals three, but it's not the fact that empirical objects-- We don't do empirical experiments to see whether two plus one equals three.
我们都相信有些东西,使2加1等于3是正确的,但这不是说现实的东西,我们不会在现实中做实验,去看看二加一是不是等于三
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Sometimes you see this written when you see p orbitals, one is written as plus, one is written in minus.
有时候你们看ｐ轨道时会看到，一个写成正号一个写成负号。
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So, helium plus is a one electron system.
所以氦正离子是一个单电子系统。
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q2 So I'm going to write this as q2 over q1 over minus one plus q2 over q1.
因此这等于q2除以q1，除以负1加上q2除以,我这么做的目的是。
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q1 So we saw that efficiency is one plus q2 over q1.
效率等于1加q2除以。
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