志願者

In a sentence

• 他是一名志愿者，正在帮助社区进行清洁活动。

  He is a volunteer actively helping the community with cleaning activities.

  In this sentence, '志愿者' (volunteer) refers to an individual who dedicates their time and effort voluntarily to assist in community activities.

• 成为志愿者可以使人感受到帮助别人的快乐。

  Becoming a volunteer can bring people the joy of helping others.

  Here, '志愿者' is presented as a role or status that one can assume to experience the satisfaction of contributing to society.

• 许多大学生在课余时间选择成为志愿者服务社会。

  Many university students choose to become volunteers to serve society during their spare time.

  In this instance, '志愿者' highlights the act of participating willingly in service-oriented activities, often undertaken by individuals like students.