形容词
中文翻译：自发的
同义词：
['involuntary', 'unrestrained例句：1. The spontaneous decision to help the homeless was a brave one.（决定帮助无家可归者是勇敢的。）']
例句：
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1. The spontaneous decision to help the homeless was a brave one.
决定帮助无家可归者是勇敢的。
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2.The spontaneous outburst of anger was unexpected.
愤怒的爆发是出乎意料的。
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3.The spontaneous agreement between the two parties was based on mutual respect.
双方的自发同意是基于相互尊重的。