We get all used to the billion dollar line of credit at the treasury, but not all will somehow get it.

我们已经习惯了,动辄上亿的,授信额度,在财政部，但是不是所有人都能拿到的。

斯坦福公开课 - 经济学课程节选

So you need hundreds of millions of doses, at least, and you need a way to distribute that around the world, and you need a way to keep track of who got sick and who didn't after they got vaccinated.

至少需要上亿支的剂量,还得有办法将疫苗运送到世界各地,你还要一种方法进行跟踪,在接种疫苗之后谁得病了和谁没得病

耶鲁公开课 - 生物医学工程探索课程节选