名词
中文翻译：志愿行为
同义词：
['voluntary service', 'selfless service']
例句：
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1.Many people volunteer to help those in need.
许多人自愿帮助有需要的人。
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2. The volunteers worked tirelessly to clean up the park.
志愿者们辛勤工作，清理公园。
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3. He decided to volunteer for a local charity.
他决定为当地慈善机构做志愿者。