volunteer

He works as a volunteer in his off time.

在业余时间，他从事志愿者工作。

The hospital relies on volunteers.

医院依靠志愿者。

She volunteered to help at the shelter.

她自愿到收容所帮忙。

Many volunteers helped clean up after the storm.

许多志愿者帮忙清理风暴后的废墟。

He joined the army as a volunteer.

他作为志愿兵参军。