VOA慢速英语:美国大学在要求学生接种新冠疫苗问题上存在分歧

herd immunity - n. herd immunity is a form of protection from infectious disease when a large percentage of a population has become immune to an infection, whether through vaccination or previous infections, thereby reducing the likelihood of infection for individuals who lack immunity.

ambiguity - n. something that does not have a single clear meaning

appropriate - adj. right or suited for some purpose or situation

bioethics - n. the study of the ethical issues emerging from advances in biology and medicine.

transfer - v. move to another school