So far this year, Boeing - has taken orders for 73 planes, but with cancellations of 66, the net order intake is only seven jets.

VOA: standard.2009.06.16

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 if we add them all up, there should be no net charge on the molecule, if the molecule is neutral.

因此如果我们把它们都加起来，这个分子上应该没有净电荷，如果这个分子是中性的话。

麻省理工公开课 - 化学原理课程节选

so you can see that there is going to be two sets in antibonding, three sets in bonding for a net of one, giving us the single bond.

因此你能看到,反键轨道上有两组，三组成键，得到一组净成键，所以成的是单键。

麻省理工公开课 - 固态化学导论课程节选

So, a massless body cannot have a net force on it, because the acceleration of the rope cannot be infinite.

所以没有质量的物体不会受到力,因为绳子的加速度不可能是无穷大

耶鲁公开课 - 基础物理课程节选

If I short the one-period bond it cancels out, so I've made no net purchase in 1925.

卖空一单位一年期债券则刚好抵消,所以我在1925年的净买入为零

耶鲁公开课 - 金融市场课程节选

shuttle cs50 net So if you go back to shuttleboy.cs50.net, you can pre-order for free your own CS50 Shuttle Cards, Shuttle Cards particularly those of you in the Quad, Mather and the like.

如果你去看，你可以免费，提前预定自己的。

哈佛公开课 - 计算机科学课程节选

And during that time, a new kind of structure arose called news groups that is where computers on the net will be used to collect e-mails and keep them, so that other people might view a conversation conducted an e-mail, and this will be categorized by topics.

在那段时间里，一种新结构出现了,叫做“新群体“，它是连网的电脑用来,收集和保存电子邮件的地方，以便于,其他人可以查阅通过电子邮件进行的会话,它会以话题进行分类。

麻省理工公开课 - 媒体、教育、市场课程节选

So if you have some charge in the nucleus, but you also have repulsion with another electron, the net attractive charge that a given electron going to feel is actually less than that total charge in the nucleus.

所以如果在原子核中，有一些电荷但是你也有来自，另一个电子的排斥力,那么一个给定电子的,吸引电荷感觉到的事实上,小于原子核中的总电荷。

麻省理工公开课 - 化学原理课程节选

We only have the one bond so the actual HF molecule is polar, it has a net dipole.

但HF中只有一根键,所以分子也是极性的而甲烷中有一个网状偶极。

麻省理工公开课 - 固态化学导论课程节选

So now that means if this is where the center of positive excess charge lies and on top of it is the center there is no displacement of the charge so there is no net dipole.

所以现在我们说,如果正电荷中心,就位于,那么还是在这里负电荷中心也在这里,所以没有空间偶极。

麻省理工公开课 - 固态化学导论课程节选

So realize the support structure is now in place and in progress so do just let us know at help@cs50.net if you have questions that can't be addressed during office hours.

所以请意识到支撑结构已经出来了，并且正在进行,如果需要帮助，如果在课堂时间有任何不懂的问题,请在help@cs50，net上面给我,留言。

哈佛公开课 - 计算机科学课程节选

And so if you are a bit of a geek and would like to play net/aces with this you can go to cs50.net/aces and I don't think Willie will give it to you to keep but you can borrow and play for some amount of time in exchange for some feedback on it.

所以，如果你有兴趣并想玩玩这个,那么你可以访问cs50。,但是我觉得Willie不会让你保管它,你可以去借，然后玩一段时间，但作为交换条件,你需要反馈一些意见。

哈佛公开课 - 计算机科学课程节选

And so now we have net charge.

然后我们得到了净电荷。

麻省理工公开课 - 固态化学导论课程节选

And so, what's the net energy?

因此，什么是净能量呢？

麻省理工公开课 - 固态化学导论课程节选

So I have so-called SSH'd into the cloud.CS50.net.

所以我在网站cloud，CS50，net植入了一个叫做“SSH’d“的东西。

哈佛公开课 - 计算机科学课程节选

So we can compare the two electron configurations, and we can actually think about what we figure out from them, we see that two are lowered in energy, two electrons are raised in energy, so we have no net gain or no net loss in energy for h e 2.

我们可以比较两种电子构型，我们可以考虑,我们发现这，两个电子能量变低，两个电子能量升高，所以在He2里没有净的能量得失。

麻省理工公开课 - 化学原理课程节选

So what am I saying? The net force is zero.

为什么要怎么说，因为合力为。

麻省理工公开课 - 固态化学导论课程节选

I am going to say if that electron is to stay in its orbit, that is to say it doesn't flee the atom, it doesn't collapse under the nucleus then the sum of the forces on the electron must be zero No net force. And so that will be the sum of a dynamic force plus an electrostatic.

如果电子会保持在它的轨道上运行,既不脱离原子的话，它就不会由于原子核对它的吸引力而被瓦解掉,电子所受的合力一定为零,由于没有合力,所以电子所受力为动态力和静电力的总和。

麻省理工公开课 - 固态化学导论课程节选