1 ADJ-GRADED (行为)自然的，自发的 Spontaneous acts are not planned or arranged, but are done because someone suddenly wants to do them. (行为)自然的，自发的
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Diana's house was crowded with happy people whose spontaneous outbursts of song were accompanied by lively music.
戴安娜的家里挤满了兴奋的人们，他们伴着欢快的音乐不由自主地引吭高歌。
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I joined in the spontaneous applause.
我跟着也自然而然地鼓起掌来。
SYN unplanned, impromptu, unprompted, willing
spontaneously -
As soon as the tremor passed, many people spontaneously arose and cheered.
震感刚一过去，很多人就自发地站起来欢呼。
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He was never spontaneously warm or friendly towards us.
他从未自然而然地对我们表示过热情或友好。
2 ADJ 自然的，自发的(指由于内部原因而非外界影响所引起的) A spontaneous event happens because of processes within something rather than being caused by things outside it. 自然的，自发的(指由于内部原因而非外界影响所引起的)
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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。
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...a spontaneous explosion.
自爆
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