这个报价还有效吗？

Is the offer still open?

《牛津词典》

或者反例？这还有效吗？

Or that a counter example? Is that still valid?

youdao

可是我还不确定签证是否还有效。

But I'm not sure If my visa is still valid.

youdao

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

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

耶鲁公开课 - 生物医学工程探索课程节选