One who enters into any service of his own free will; esp., one who offers himself for military or naval service.

自愿者；义勇军。

One who performs a service without pay.

无报酬的工作者；义工。

To offer one's services freely.

自愿义务服务。

To enlist as a volunteer.

登记为原愿者。

To offer or bestow without constraint or compulsion.

自愿供献；自愿给与。

Pertaining to volunteer; voluntary.

自愿投效的；自动的。

Performed without pay.

义务的。