VOA慢速英语:美国去年冬天有8万人死于流感

exact – adj. fully and completely correct or accurate

statistical – adj. of, relating to, based on, or employing the principles of statistics

pandemic – medical noun : an occurrence in which a disease spreads very quickly and affects a large number of people over a wide area or throughout the world

strain – medical noun : group of closely related living things that look similar but possess one or more unique characteristics