VOA慢速英语:为什么美国人在橄榄球上花费数十亿美元

waiver – n. an official document indicating that someone has given up or waived a right or requirement

participant – n. a person who is involved in an activity or event

league – n. a group of sports teams that play against each other

monitor – n. to watch, observe, listen to, or check (something) for a special purpose over a period of time

anticipate – v. to think of (something that will or might happen in the future)

insert – v. to put (something) in something

engraved – adj. carved or cut lines, letters, designs, etc., on a hard surface