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There are children who by a relatively modest donation to an effective aid agency, you could save their lives.
要拯救这些儿童的生命,只需要你向比较有效的救助机构,捐赠适量的钱款。
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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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But essentially the only reason there was any way that that was an effective approach was because people basically realize "Oh this is a good idea and we agree with that as a culture."
但是，归根结底，这种方式之所以,能够取得成功，是因为,人们意识到,“哦，这挺好的，我们的文化可以接受它“,“哦，这挺好的，我们的文化可以接受它“
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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 if we have total +2 and complete shielding -1 where that can actually negate a full positive charge, because remember our nucleus is plus 2, +1 one of the electrons is minus 1, so if it totally blocks it, all we would have left from the nucleus is an effective charge of plus 1.
抵消一个完全的正电荷,因为记住我们的原子核是,其中一个电子是,所以如果它完全挡住了它，我们从原子核中留下的，全部有效电荷就是，所以，在我们的第一个例子中,我们的第一种极端情况。
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C indeed represents an effective displacement.
其实表示的是实际位移
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What is an effective way to build muscles?
锻炼肌肉有什么有效的方法？
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z So, this is what we find the actual z effective is for an electron in the helium atom.
所以这就是我们得到了实际有效的,对于一个氦原子的电子。
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The z effective is lower, so we have to put less energy in to get an ion out.
它的有效核电量更低，所以我们只需要更少的能量就能打出一个离子。
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And so that's an effective vaccines.
它是一种有效的疫苗
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But it's only an effective vaccine in the context where you have people who can go to the doctor's office, or to an urgent care, some kind of medical facility, three times, reliably, at a specified period of time.
但为了保证接种效果,人们必须亲自去诊疗室,或者在急诊室里,使用一些医学设施辅助接种,还需要接种三次,它只在一段时间内有效
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In an extreme case b, we had a z effective of 2, so essentially what we had was no shielding at all.
我们有效的z是，所以本质上我们完全没有屏蔽。
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And the point that I also want to make is the way that they differ, z effective actually differs from the total charge in the nucleus due to an idea called shielding.
我也想指出的一点是它们不同的方式,有效的z事实上不同于原子核的，总电荷量,因为屏蔽效应。
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