参加活动的人用英语怎么说

参加活动的人英文叫做 participants.
来源：participant是一个拉丁词，意思是参与者。
例句：
The participants in the race were all very competitive.
(比赛的参赛者都非常有竞争力。)
The number of participants has increased significantly this year.
(今年参加者的数量显著增加。)
The participants were asked to fill out a survey before leaving.
(参加者在离开前被要求填写一份调查问卷。)