The Alzheimer's Association says FDA-approved drugs are effective for half the people who take them.

VOA: special.2011.02.08

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。

麻省理工公开课 - 化学原理课程节选

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。

退休很神奇 - SpeakingMax英语口语达人

She says the online tool was very effective for those who used it at least once a month.

VOA: standard.2010.07.30

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。

麻省理工公开课 - 化学原理课程节选

So she says(In other words) while emergency contraception is effective for individual women, advance provision can't be expected to make a different in the community.

VOA: standard.2010.03.22

And so they're already very safe, very effective vaccines available for many infectious diseases.

所以这些疫苗非常安全有效,常备用来对付各种传染病

耶鲁公开课 - 生物医学工程探索课程节选

"I am sure that the cooperation between the countries in the field of strategic security is more effective for both Russia and the United States than any AMD , any armed forces or any military operation."

VOA: standard.2009.09.17

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。

麻省理工公开课 - 化学原理课程节选

The Race to the Top competition will look for states and local school systems with effective reforms in four areas.

VOA: special.2009.07.30

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。

麻省理工公开课 - 化学原理课程节选

The Centers for Disease Control says HEPA filters are effective in clearing the air of many particles that cause disease.

VOA: special.2009.07.14

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。

麻省理工公开课 - 化学原理课程节选

In the United States, the Armed Forces Radiobiology Research Institute is looking for more-effective treatments for radiation exposure.

VOA: special.2011.03.30

And so there's a lot of interest, not just in developing vaccines for diseases that we don't have vaccines for, but for delivering vaccines that are more effective.

所以我们感兴趣的领域,不仅包括针对还没有疫苗的疾病,来研发疫苗,还要开发更有效的疫苗

耶鲁公开课 - 生物医学工程探索课程节选

And it sank,too. The Confederacy also developed very effective underwater explosive devices for use in the harbors.

VOA: special.2009.09.10

So again, when we check these, what we want to see is that our z effective falls in between the two extreme cases that we could envision for shielding.

所以当我们再一次检查这些时，我们想看到的是,有效电荷量处于两种极端案例中,这两种极端案例。

麻省理工公开课 - 化学原理课程节选

The others lost their jobs because they were rated "minimally effective" for a second year.

VOA: special.2011.08.11

And this just is another list, I mainly wanted you to have it in your notes of diseases that are important around the world, for which there are very active programs to develop either vaccines or more effective vaccines.

这是另一个表,我希望你们做笔记时把它加到,世界上这些严重的传染疾病上,因为现在有一些项目致力于开发,针对这些疾病的疫苗或者改进式疫苗

耶鲁公开课 - 生物医学工程探索课程节选

The country has not had an effective government for almost twenty years.

VOA: special.2009.04.25

z So the main idea here is z effective is not z, so don't try to plug one in for the other, they're absolutely different quantities in any case when we're not talking about a 1 electron atom.

所以这里主要的观点是有效的z不同于，所以不要尝试将一个插入到另一个，当我们不在讨论1个电子的原子时,它们在任何情况下是绝对不同的量子数。

麻省理工公开课 - 化学原理课程节选

Over at competitor General Electric, actor Ronald Reagan -- later the fortieth president of the United States -- and often referred to as the Great Communicator, was for many years an effective commercial spokesman every week on the GE Theater.

VOA: special.2011.07.21

And it turns out that if we have a, for example, for s, a very large z effective or larger z effective than for 2 p, and we plug in a large value here in the numerator, that means we're going to end up with a very large negative number.

结果是如果我们有一个，举例来说对于s一个很大的有效电荷量或者,比2p大的有效电荷量，并且我们将一个较大的值代入计算器，那意味着我们最后会得到,一个非常大的负数。

麻省理工公开课 - 化学原理课程节选

Aimee Picchi, who writes about business and marketing for AOL's Daily Finance, says studies have shown the ads are quite effective.

VOA: standard.2010.01.27

Meanwhile,expedited efforts are going forward on several continents to develop an effective vaccine for the new strain of influenza.

VOA: standard.2009.04.30

Economists have long considered government spending, especially on infrastructure, to be an effective tool for revitalizing a stagnating economy.

VOA: standard.2009.10.16

Dr.Priego says so far the combination has been effective in prolonging life for patients with pancratic cancer.

VOA: standard.2010.01.12

Researchers in Melbourne hope to isolate the most effective compounds for use in a potential vaccine.

VOA: standard.2010.01.20

Noor Huda Ismail, with the International Institute for Peacebuilding in Jakarta, says Noordin was the most charismatic and effective advocate for violence for Indonesian militants.

VOA: standard.2009.09.21

"Toyota engineers have developed effective and durable solutions for the vehicles we have recalled."

VOA: standard.2010.03.04