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 workers are helping to clean up the city.
志愿者正在帮助清理城市。
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2. He decided to volunteer for a local charity.
他决定为当地慈善机构做志愿者。
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3. The voluntary work was done by many people who came together to help.
许多自愿参与的人聚集起来帮助。