spectator       
noun [ C ] uk/spekˈteɪ.tər/ us/spekˈteɪ.t̬ɚ/
B2 (尤指体育赛事的)观众
a person who watches an activity, especially a sports event, without taking part
  They won 4–0 in front of over 40,000 cheering spectators. 他们在4万多名观众的加油助威声中以4比0获胜。 
 - More examples
 - A few incredulous spectators watched as Paterson, ranked 23rd in the world, beat the champion.
 - Marshals struggled in vain to prevent spectators rushing onto the racetrack.
 - Will spectators please stay behind the rail?
 - At the last minute, we roped in a couple of spectators to complete the team.
 - The racing car left the track at 120 mph and scythed through the crowd of spectators, killing ten.