n.自发性，自然发生，自发行为[行动]
spontaneous outpourings of praise
一片自然迸发的赞美声
I had another spontaneous miscarriage at around the 16th to 18th week.
我在大约第16至18孕周时又经历了一次自然流产。
a spontaneous offer of help
主动提出帮助
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