Experts say the vaccine is safe and very effective.

VOA: special.2009.05.26

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

Now, the polio vaccine that Salk produced was very effective, but it required a fairly large dose of the vaccine and it had to be injected into the arms of children.

索尔克生产的小儿麻痹症疫苗效果显著,但是,该疫苗的单支注射剂量非常大,而且必须通过小孩的手臂进行注射

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

Germany was very effective in these-- they had advanced bureaucracy, a good postal service, and they had a network of post offices all over the country-- every little town had a post office.

德国人处理此事非常有效-,他们推进了行政机制和邮政服务，出现了全国范围的邮局网-,每个小镇都有一所邮局。

耶鲁公开课 - 金融市场课程节选

Collecting patient data or ordering drugs and lab tests using handheld devices can be very effective in reducing errors.

VOA: standard.2010.02.24

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

And video games are one of those methods that are assured to be very effective."

VOA: standard.2010.04.20

Part of the reason why I'm endorsing this market stability regulator is that there's no way we can set up a system that is both very effective in allocating resources and that is also very stable.

我赞成市场稳定性监控者,的部分原因是,没有方法建立一个,既能完全有效配置资源有非常稳定,的系统。

耶鲁公开课 - 金融市场课程节选

"we would be forced to buy power that we don't need and idle existing generation or have hydro that is very cost effective -- very cheap,actually -- being replaced by very expensive power."

VOA: standard.2010.03.23