• 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

  • It is important to keep going after you finish this course.

    在完成这一课程后,进一步的学习非常重要。

    It's important 课堂 - SpeakingMax英语口语达人

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