Definition: someone who is involved in an activity Level: C1
每位完成马拉松的参与者将获得证书。
Each ___participant who completes the marathon will get a certificate.
她是社区服务项目的积极参与者。
She was an active ___participant in the community service project.
会议吸引了来自不同国家的一百多位参与者。
The conference attracted over a hundred ___participants from various countries.
