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No, we call that work positive work. All right, so that means we need to put a negative sign right here, by convention.
历史上有过不同的习惯，这里我们规定,如果环境对系统做功。
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They're going to move from a negative pole to a positive pole, so they're going to move through this gel.
它们会从负极移向正极,会通过这块凝胶板
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But when we're thinking about actual wave behavior of electrons, it's just important to keep in the back of our head that some areas have positive amplitude and some have negative.
电子的波动行为时,我们，要记住,某些地方是正的,某些地方是负的,当我们讲到。
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Coulomb's law says the negative will be attracted to the positive, and the atom will collapse.
库仑定律说,负电荷会被吸引到正电荷上来，原子会坍塌。
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So zero is supposed to be neither positive nor negative, and here I am just simplifying and saying it's actually going to be negative.
所以0不是一个正数，也不是负数，在这里我只是简单地,说明它实际上会是负数。
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Above some temperature is going to be positive, below some temperature is going to be negative.
低于这一温度它是负数，我们一般忽略这些高阶项。
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There's two--One technical distinction that people love to put on Intro Psych exams is that the difference between positive reinforcement and negative reinforcement.
心理学导论的考试中,会经常考到一个术语上的区别,即正强化,与负强化之间的区别。
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There are two possible ways of reacting to this, one positive and one negative.
对此可以有两种应对方法，一个积极的一个消极的。
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The two analogies we use " was strengthening our immune system or stronger "psychological engine" that has the capacity to endure more not just from the negative to zero, but also from the zero to the positive.
我们使用的两个类比,是加强我们的免役系统或加强“心理引擎“,获得更强大的忍受能力,不只是从负到零，还要从零到正。
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But if life would no longer have anything good to offer you, if what you then would have had would have been something negative instead of something positive, then at that point, dying wouldn't actually be a bad thing.
但是当生命再也不能向你提供美好，届时我们面对的是,消极的而非积极的东西，那时死亡可能不是一件坏事。
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If when x is low, y also tends to be low, then this will be negative number and so will this, so their product is positive.
如果x取值小,同时y值也小,这将是一个负值,这个也是负值,负负得正,结果是正值
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No, we can't. Because if l equals 1, we can not have m sub l equal negative 2, right, because the magnetic quantum number only goes from negative l to positive l here.
不行，因为如果ｌ等于１,ｍｌ的值不可能等于－２，对吧，因为磁量子数的值,这时只能从－１到１
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Now, what happens during an action potential is that that membrane potential changes very rapidly and it changes from being negative to being more positive.
在动作电位产生时,膜电位迅速改变,从较负的电位向更正的电位改变
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So it's like negative 2 billion to positive 2 billion.
所以大概是负20亿到正20亿。
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So you don't want to put in a negative energy, that's not going to help you out, you need to put in positive energy to get an electron out of the system. So that's why you'll find binding energies are always negative, and ionization energies are always going to be positive, or you could look at the equation and see it from there as well.
因为这对电离没有帮助,你需要一个正的能量,使得电子脱离这个系统,这就是为什么你会发现,结合能总是负的而电离能总是正的,或者你们看这个方程也可以发现这一点。
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I mean, if you do the--If you look at the results for the study, it turns out that there is an association as bias to view white Americans as positive and African Americans as negative but it shows up in half a second difference.
如果你看这些研究的结果，你会发现人们有一种偏见,把白人和积极的意义联系在一起,把黑人与消极的意义联系在一起,你只有看这半秒的差别，才能发现这种偏见。
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The total negative charge of the electrons is equal to the positive charge of the nucleus.
所有电子的负电荷,等于核的正电荷。
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putting all those things together, if you looked at this question again we'd get 100% on it, 0 9 that our only option here is 0. 9, and that it's not the negative, it's the positive version, because we're talking about how much energy we have to put into the system in order to eject an electron.
把这些放在一起，你们再看一下题目,大家100%都能选对，我们唯一的选择就是这个，它不是负数，它是正的，因为我们说的，是要,把电子激发出来,需要提供的能量。
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Often a good thing to start with is to put the lowest ionization energy atom in the middle, and if you don't have charge separation then go with that structure, but if you do find you have a lot of separation, such as the case in negative 2, positive 2, and minus 1, then you want to say wait a second, this is really bad in terms of formal charge, let me go ahead and see what other options I have here.
通常一开始把电离能最低的原子,放在中心位置就很好了，如果你发现电荷没有分开,那么这个结构就没问题了，但是如果你发现有很多分开的电荷，比如这种情况，有负二，正二和负一，那么你会想要说等一下，从形式电荷来看这很不好，让我去看看其它可能的选择。
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Because we've got one q1 and then we're adding q2 over q1 to it, but we've got negative q2 is a positive number.
这是因为这里有个,然后加上了q2除以，但是我们知道负的q2是个正数。
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So the allowed values for m sub l 0 are going to be negative l, all the way up to 0, l and then up to positive l.
所以m小标l的可能值,是从负l，一直到，然后到正。
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So that's where you have to think about whether it's positive or negative.
你就要想想，它是正还是负,你们现在不需要。
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The second particle was deflected almost not at all. But what he could tell from the fact that there was a second particle at all, and the fact that it was in this direction, is that in addition to his negative particle, he also, of course, had a positive particle that was within this stream of rays that were coming out.
粒子的强烈信号,有着强烈的对比,第二个粒子几乎，不发生偏转，他能判断这是，第二个粒子的原因是它在这个方向,所以在出射射线中,除了有带负电的粒子外。
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