volunteer    v. offer to do sth. without being paid 自愿（做某事）  Jenny volunteered to clean up afterwards.珍尼自愿过一会儿清除打扫。  He volunteered to show us around the school.他自愿带我们参观学校。 n. [C] sb. who offers to do sth. without being paid 志愿者  Any volunteers?谁自愿来？  This is a huge project, but we have a lot of volunteers for the most difficult work.这是一种大项目，但有许多志愿者乐意来承担其中最困难旳工作。