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
 2/3   首页 上一页 1 2 3 下一页 尾页