参与者 (cānyùzhě) means "participant," referring to a person who takes part in an activity or event. It is formed by adding the agent suffix 者 to the verb 参与 (to participate).
这次比赛的参与者来自二十多个国家。
Zhè cì bǐsài de cānyùzhě láizì èrshí duō gè guójiā.
Participants in this competition came from more than twenty countries.
所有参与者都需要提前在网上报名。
Suǒyǒu cānyùzhě dōu xūyào tíqián zài wǎngshàng bàomíng.
All participants need to register online in advance.
作为活动的参与者,你可以免费获得一件纪念T恤。
Zuòwéi huódòng de cānyùzhě, nǐ kěyǐ miǎnfèi huòdé yī jiàn jìniàn T xù.
As a participant in the event, you can receive a commemorative T-shirt for free.