越来越多美国人耐力创纪录

athlete - n. a person who is trained in or good at sports, games, or exercises that require physical skill and strength​

crazy - adj. unable to think in a clear or sensible way​

endurance - n. the ability to do something difficult for a long time​

sponsorship - n. an arrangement in which a sponsor agrees to give money to someone or something​

online - adj. connected to a computer, a computer network, or the Internet​

dynamic - adj. always active or changing​

tendency - n. a quality that makes something likely to happen or that makes someone likely to think or behave in a particular way​

post - v. to add (a message) to an online message board​

vertical - adj. going straight up​