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If you or I buy it, it costs $51 per dose, you need three doses to be effective.
如果你或者我购买它,每支将花费五十一美元,你需要购买三支才会起效
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where the super model could not be an effective model for bikinis after a certain age.
比基尼模特在达到一定的年龄后就无法再担任这份工作了。
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We want to share things, but we want to get more scientific about how we share things and that means-- and we want to be effective.
我们才想要分摊风险，但我们得用更科学的方式,也可说是更有效率的方式-,来分摊风险。
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Particularly, if we took advantage of the fact that this is a virus that's easily transmitted orally and could you make a vaccine that would be effective orally as well, that would be a tremendous advantage, especially in children who don't like to get shots.
尤其是,如果我们可以利用这种病毒,很容易经口传播这一事实,制造出一种,可以通过口服而起到同样效果的疫苗,那么这将是一个巨大的飞跃,特别是对于那些不喜欢打针的孩子
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And if we experimentally know z what the ionization energy is, we actually have a way to find out what the z effective will be equal to.
我们实际上就有了一个办法,去找出有效的，等于多少,我们可以使用这里的方程。
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How do you want to aim it so you can be most effective?
你怎样瞄准才能使攻击最有效
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He's going to ameliorate their conditions, he's going to make their slavery on his plantations so effective, so good, such a even joyous form of labor, that he will be doing God's work by improving slavery.
他会改善奴隶们的生活条件,他会让自己种植园的奴隶们,提高工作效率,优化管理模式,奴隶甚至是一种令人享受的工作,他会按照上帝的旨意提升奴隶的生活水平
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You just need to remember what's happening to z effective, which really tells us what's happening with all the trends, and once you know z effective, you can figure out, for example, what direction the atomic radius should be going into.
你只需要记住有效核电量的规律，实际上它会告诉我们所有的规律，只要你知道了有效核电量的规律，你就可以判断，比如，原子半径会向着哪个方向发展。
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So our minimum that we're going to see is that the smallest we can have for a z effective 1 is going to be equal to 1.
所以我们能够看到的,最小的有效电荷量,等于。
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I think the smallpox vaccine we made now would probably be better, more effective, and safer than the vaccines we made in the '50s.
我相信若我们现在制造天花疫苗,应该会比五十年代的更有效更安全
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This cell can only be an effective barrier if there's no way to get past it.
这些细胞只有密不透风,才足以形成一道屏障
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So we should be able to calculate a z effective for any atom that we want to talk about, as long as we know what that ionization energy is.
我们应该可以计算出任何一个,我们想要谈论的原子的有效电荷量，只要我们知道电离能是多少。
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But what you should be able to do is take a look at a list of answers for what we're saying z effective might be, and determining which ones are possible versus which ones are not possible.
但是你们应该能够做到的,是看一下这个可能的,有效电荷量的答案列表，并且确定哪些是可能的,哪些是不可能的。
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Not only are we taking away an electron here, but we're also going to decrease shielding, so the electrons that are already in there are going to feel a higher z effective and will be pulling and the atom will be getting smaller.
这不只是因为我们拿走了一个电子，还因为我们这样做会减小屏蔽效应，这样留下的电子,将会感受到更大的有效核电量,也就会感受到更强的吸引力，使得原子变得更小。
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z So in our first case, our first extreme case, would be that the z effective that is felt by electron number 1, is going to be plus 1.
被1号电子感知到的有效的，是+1所以,我们所能做的是计算出，我们从这个。
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Well, the vaccine turned out to be about 70% effective.
疫苗的有效率为百分之七十左右
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