名词
中文翻译：自愿的
同义词：
['selfless', 'unconditional', 'spontaneous']
例句：
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1. The volunteersworked tirelessly to save the animals from the fire.
志愿者们不辞辛劳地拯救了动物免受火灾之苦。
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2.He was a selfless man who always put others' needs before his own.
他是一个无私的人，总是把别人的需要放在自己的前面。
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3. The spontaneous act of kindness by the stranger touched the hearts of all.
陌生人自发的善举感动了所有人。