spectator

观众、看比赛的人多指体育赛事

Thousands of spectators filled the stadium before the final match.

决赛开始前，数千名观众挤满了体育场。

旁观者、围观者

He stayed a spectator while the others argued about the plan.

其他人为那个计划争论时，他始终只是个旁观者。

目击者

Several spectators described the accident to the police.

好几名目击者向警方描述了那场事故。

观众的、供观赏的仅用于名词前

Baseball is still the country's most popular spectator sport.

棒球仍是该国最受欢迎的观赏性运动。