形容词
中文翻译：Unknown
同义词：
['gratuitous', 'unpaid', 'non-compensated']
例句：
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1. The volunteers are working tirelessly to help the homeless.
志愿者们正在不懈地帮助无家可归者。
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2. He volunteered for the charity event last weekend.
他上周末为慈善活动做志愿者。
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3. The voluntary work done by the community is greatly appreciated.
社区所做的自愿工作受到高度赞赏。