participate
/pɑ:ˈtɪsɪpeɪt; pɑr`tɪsəˌpet/ v[I, Ipr]
~ (in sth) take part or become involved (in an activity) 参加, 参与（某活动）
participate in a competition, discussion, meeting 参加竞赛、 讨论、 会议
She actively participates in local politics. 她积极参与本地政治活动.
How many countries will be participating (in the Olympic Games)? 有多少国家要参加（奥林匹克运动会）?