"The pill 50 years ago was a very high dose pill, "It is a fraction of that now.

VOA: standard.2010.05.12

So, even if the cost is small, $10 a dose, it quickly amounts to a large amount of money.

因此,即使单只成本很小,可能只有十美元,但是这很快就会累积成为很大的金额

耶鲁公开课 - 生物医学工程探索课程节选

If you or I buy it, it costs $51 per dose, you need three doses to be effective.

如果你或者我购买它,每支将花费五十一美元,你需要购买三支才会起效

耶鲁公开课 - 生物医学工程探索课程节选

I didn't have the commercial price for the chickenpox vaccine called Varivax but you can imagine that it's even more than $50 a dose for that one.

我不知道水痘疫苗,伏痘敏的商业价格,但是你可以想象一下,这种疫苗每支的价格要超过五十美元

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