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。
Such as if you hit the U key, it displays all keyframes, but if there are no keyframes, it shows nothing.
比如，如果你按U键，会展开关键帧，但是如果你没有关键帧，就不起什么作用。
"If there is a treaty change that gives Britain an opportunity" Cameron said. "treaty change can only happen if it is agreed by all the 27 member states of the European Union."
“如果条约存在变更，英国会获得良机，”卡梅伦称，“只有欧盟27个成员国一致同意变更条约方能实现条约变更。”
There are also many verses in Proverbs that say God will bless your business if you have integrity and if you are honest and fair in all your business dealings.
在箴言书里，有好多经文说如果你在做生意时，正直诚实公平，上帝会在你的生意当中，给你赐福。
And if you don't, email me and we will go through it all again by email, I will stop there, but there is five minutes for questions if anyone has got any energy.
如果还不能，给我发电邮，我们一起通过电邮通读，今天到这里，有五分钟的提问，有人想问吗？
There is also a check-box that allows the user to specify if the data should be aggregated, that is, if it has all of the versions of Internet Explorer added together.
还有一个复选框，允许用户指定是否应该聚集数据，也就是说，是否把InternetExplorer的所有版本都添加到一起。
Using ping is a simple and quick way to determine if there is a problem, how fast data is being sent between servers, and if you have connectivity at all.
使用ping是确定是否存在问题、数据在服务器之间的传输速度，以及您是否能够连接目标的简单而快速的方法。
Notice one last piece. If I'm going to do that, run through all possible answers, I still want to know, gee, what if there aren't any answers? How do I return that case?
注意最后一段，如果我要这样做，也就是运行所有可能的答案，我还是想知道要是没有结果呢？，在这个例子中应该返回什么呢？
Conflict: if there's nothing to do on a site, then it doesn't matter if all your friends are there or not.
矛盾：如果在一个网站上没有什么可干的，那么你的朋友在不在哪儿都无关紧要了。
If there is a change to the protocol or data type — for example, if an element is added — then you must locate all the different documents in which this data type is recorded and make the change.
如果协议或数据类型发生变更——举例来说，如果添加了元素——那么您必须找到记录了该数据类型的所有不同的文档，并进行变更。
The powdery snow glares like broken glass, touching everything as if all of the rooftops and trees and lawns were made of light, as if there were no such thing as darkness.
高低不一的积雪反射出耀眼的光芒,就象洒落在人间一块块破碎的玻璃，无处不在:屋顶,树上,草坪,一切都是光亮,仿佛黑暗无处可遁.
There is therefore an optimum place to hit the ball if you want maximum spin: if you hit the ball too close or too far from the centre of gravity, it will not acquire any spin at all.
因此，如果你想获得最佳转速，这里有个最优的踢球部位：如果你的踢球部位距离重心太近或太远，足球将不会旋转。
If you think this life is all there is, then you will set goals as if this life is all there is.
如果你认为今生就是一切，那么你会设定目标，好像这辈子就是一切。
If the tank is not filling all the way (there should be a fill line on the inside of the tank), carefully bend the bulb of the float valve up a bit and see if the tank will fill.
如果水箱没有充满正常水量(水箱内侧应该有一条水位线)，慢慢地弯曲一下浮囊阀，看水位会不会上升。
You will stay here forever if you go on picking, and if you gather all the flowers now there will be none for to-morrow.
如果你再继续摘我就不等你了，如果你今天把这里的花都摘完了那明天你就一朵也看不到了。
Even if you "have all the smartest bottom-up, tech-savvy people working for you," he says, "if the candidate and the top of the campaign want to run a top-down campaign, there is nothing you can do."
他说，即使你“有最精明的自下而上的精通技术的人为你工作，如果候选人和竞选班子高层想进行自上而下的的竞选，你也无计可施。”
And the reason for that because an argument is valid if and only if there are no possible situation in which all its premises are true and its conclusion false.
原因是因为论点有效，如果且仅如果没有可能情况，所有的前提都为真结论为假。
If you are silent for long periods, they will do their best to draw you out or will ask if you feel all right or if there is anything that they can do to help you.
如果你长时间保持沉默，他们就会竭尽全力让你说话，或者询问你是否还好，他们有没有什么可以帮忙的。
Indexed portfolios, you basically say, I want to own all of the stocks that there are, and if the stock market goes up, I make money, if the stock market goes down, I lose money.
指数化资产组合，使之我拥有这些股票，如果股市走高，那么我就赚钱，如果股市走低我就赔钱。
It would have been strong 100 years ago, but now I probably wouldn't have picked it up at all if I hadn't deliberately tuned in to that wavelength to see if there was any signal left.
也许100年前会很强烈，而现在湮没在其他声音里了，我要抽丝剥茧的才能寻得半点蛛丝马迹。
Still, there were some--an unfortunately tiny fraction of respondents--who would not be concerned if Facebook ended, even if meant losing all their data.
然而，另有一点少得可怜的应答者表示，如果Facebook中止，即使那意味着他们会丢失全部信息，他们也不会介意。
If there's no route at all, then ping will inform you, but if there is, you will need to establish what it is to verify with the network administrator that it's correct.
如果根本没有路由，ping会通知您，但是如果有路由，就需要让网络管理员检查路由是否正确。
If there is no response at all, you need to establish if they are dead or just unconscious - sometimes it's very difficult to tell the difference.
如果没有回应的话，你需要确定他们是死了还是仅仅是晕过去了，虽然有时是很难分辨清楚。
Both Creationists and Evolutionists agree that if evolution is at all possible, there needs to be an excessive (if not infinite) amount of time.
创造论者和进化论者双方都同意：如果进化是可能的，则需要有一个很长的(如果不是无限的)时期。
Even if you have, it may still be difficult to say what they have in common, if indeed there is a relevant characteristic which they all share.
即便你读过，或许也仍然难说他们有什么共同之处，即便他们的确都有某种相关的特点。
If I were there, then does it actually exist? If it all exists, then do I exist?
假如我自身存在，那么这一切是否也实际存在？假如这一切都存在，那么我是否也存在？
If I were there, then does it actually exist? If it all exists, then do I exist?
假如我自身存在，那么这一切是否也实际存在？假如这一切都存在，那么我是否也存在？
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