She is a voluntary worker at the hospital. 她是在这家医院义务服务的。
Pui Hang has been a voluntary worker since primary school and has joined various kinds of voluntary service, including serving people with mental disability, elderly, patients in the hospital, etc. 自从小学开始，沛行已经参与不同类型的义工活动，包括探访老人、智障人士、医院病人等等。
He made a voluntary statement to the police. 他自愿为警方作供。
The organization is run on a voluntary basis. 这个组织是由志愿人员管理的.