n. (military) a person who freely enlists for service
n. a person who performs voluntary work
v. tell voluntarily
v. agree freely
n. 志愿者
a. 志愿的
v. 自愿
1. Many people choose to volunteer at local shelters to help those in need.
许多人选择在当地收容所做志愿者，以帮助有需要的人。
2. She decided to volunteer for the environmental project to protect the park.
她决定为环保项目做志愿者，以保护公园。
3. It is a great experience to volunteer with children and teach them new skills.
和孩子们一起做志愿者并教他们新技能是一段很棒的经历。