adv.自愿地，自动地，主动地，无偿地，义务地

She decided to volunteer at the local animal shelter voluntarily.
她决定主动去当地动物收容所做志愿者。
He joined the community clean-up project without any hesitation, volunteering his time.
他毫不犹豫地加入了社区清洁项目，自愿奉献他的时间。
Many students volunteer their services at the school library during weekends.
许多学生在周末自愿到学校图书馆服务。
She volunteered to be the team leader for the charity event.
她自告奋勇担任慈善活动的团队负责人。
He volunteered information about the crime to the police.
他主动向警方提供了关于犯罪的信息。
The retired teacher volunteered to tutor underprivileged students after school.
这位退休教师自愿在放学后辅导贫困学生。
The company encourages its employees to volunteer in the company's social responsibility programs.
公司鼓励员工自愿参与公司的社会责任项目。
She volunteered to take on the most challenging tasks at work.
她自愿承担工作中最具挑战性的任务。
The volunteers at the food bank worked tirelessly, helping distribute meals to those in need.
食品银行的志愿者们不知疲倦地工作，帮助分发食物给需要的人。
He volunteered to go first in the experiment, showing great courage.
他自愿第一个参加实验，显示出极大的勇气。