1.
voluntary adj. 志愿的,自愿的 ( 2nd line Para. 1)
The police asked for his voluntary appearance.
警察要求他自动露面。
拓展:(1)volunteer n.“志愿者”,后接介词for
Are there any volunteers for the event?
有主动做这件事情的人吗?
The work costs us nothing. It’s all done by volunteers
这项工作我们没花钱,是由志愿者完成的。
(2)volunteer vt & vi “自愿”;“自告奋勇”
volunteer sth / for
sth / to do sth
He volunteered to get some information.他愿去获取某些资料。
I volunteered my services as a teacher.’我自告奋勇去当老师。
He always volunteered for the most difficult work.
他总是主动要求做最困难的工作。
(3) volunteer vt &vi “自动说出”;“主动提供”
She volunteered the information before l had a chance to ask.
我还没来得及发问,她就自动把情况说了。