participant/participate/participation

participant /pɑ:ˈtisipənt/ n. ［c］参加者，参与者(与in连用，后接某事物)：an active participant in social work 积极参加社会工作者；treaty participants 条约参加国

 participate /pɑ:ˈtisipeit/ vi.参与，参加(in)：participate in the war (the protests, the discussion…) 参加战争(抗议，讨论)

［辨析］与attend, take part in 辨见 attend

participation n. 参加，参与（in）：The scheme aims to encourage increased participation in sporting activities. 这个方案旨在鼓励大众更多地参与体育活动。［考句］Clark felt that his participation in one of the most dramatic medical experiments of all time was worth the suffering he underwent.克拉克认为能参加有史以来最令人激动的医学实验，再苦再难也值得。