VOA慢速英语:康复者血清治疗新冠肺炎患者是突破还是试验？

convalescent - adj. recovering from an illness

plasma - n. the watery part of blood that contains blood cells

illness - n. a condition of being unhealthy, sick

standard - n. a level quality or achievement that is considered acceptable

pandemic - n. an occurrence in which a disease spreads very quickly and affects a large number of people around the world

access - n. a way of getting something

evaluate - v. to judge the value or condition carefully