volunteer
名词 volunteer:
(military) a person who freely enlists for service
同义词:military volunteer, voluntary
a person who performs voluntary work
同义词:unpaid worker
a native or resident of Tennessee
同义词:Tennessean
动词 volunteer:
tell voluntarily
agree freely
同义词:offer
do volunteer work
形容词 volunteer:
without payment
同义词:unpaid