Some economists think the plan needs to provide as much as one trillion dollars or more to be effective.

VOA: special.2009.01.09

Well, the reason, the way that we can check it is just to see if it's in between our two extreme 1 cases. We know that it has to be more than 1, because even if we had total shielding, 1 we would at least feel is the effective of 1.

好的我们可以检查它的原因和方式是观察,它是否在我们的两种极端案例之间,我们知道它必须大于，因为即使如果我们有完全的屏蔽，我们最小感到的有效值是。

麻省理工公开课 - 化学原理课程节选

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

耶鲁公开课 - 生物医学工程探索课程节选

Carol Pandak says tests found the new vaccine to be thirty percent more effective than the trivalent vaccine.

VOA: special.2010.01.18

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。

耶鲁公开课 - 金融市场课程节选

It can ensure that poor,rural people, whose lives and livelihoods, depend on the earth's productive capacity, have the means to produce more and to produce it better, GDP growth generated by agriculture has been shown to be at least twice as effective in reducing poverty as growth in other sectors. In recent years, more attention is being paid to the importance of smallholder farms.

VOA: standard.2010.03.29