形容词
中文翻译：自愿的
同义词：
['free', 'uncoerced', 'spontaneous']
例句：
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1.The volunteer firefighters were called to the scene of the fire.
志愿者消防员被召到火灾现场。
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2.The voluntary donation will help fund a new library.
自愿捐赠将资助新图书馆的建设。
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3.The voluntary organization provides free tutoring for students in need.
这个志愿组织为有需要的学生提供免费辅导。