Working as a volunteer brings great joy to me.

　　做志愿者給我帶來極大的快樂。

　　He also spent 35 years as a volunteer firefighter.

　　他也花了35年做一名消防志愿者。

　　Have you ever participated in volunteer activities?

　　你參加過義工活動嗎？

　　I helped launch a volunteer organization on campus.

　　我幫助組建了一個校園志愿者組織。

　　He likes traveling but he works as a volunteer too.

　　他喜歡旅行，但他也做志愿者。