A vaccination, for it to work around the world, has to be inexpensive, transportable, possible to use without advanced medical personnel, and those kinds of things.

而疫苗接种,为了能适用于全世界,它必须便宜,便于运输,还要能在没有高级医生的情况下使用,它应该具有诸如此类的特点

耶鲁公开课 - 生物医学工程探索课程节选