形容词
中文翻译：自发的
同义词：
['uninhibited', 'unrestrained', 'natural', 'unconstrained']
例句：
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1.The spontaneous decision to volunteer was a testament to her courage.
她自发决定志愿工作，证明了她的勇敢。
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2.The spontaneous outburst of anger was unexpected and unwelcome.
愤怒的爆发是出乎意料且不受欢迎的。
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3. The spontaneous act of kindness touched the hearts of many.
无私的行为感动了许多人。