triathlon
noun [ C ] uk/traɪˈæθ.lɒn/ us/traɪˈæθ.lɑːn/
铁人三项赛，三项全能运动
a competition in which the people competing must swim, ride a bicycle, and run particular distances without stopping between events
triathlete
noun [ C ] uk/traɪˈæθ.liːt/ us/traɪˈæθ.liːt/
三项全能运动员
someone who competes in a triathlon