名词
中文翻译：自发加倍
同义词：
['spontaneous increase', 'spontaneous growth']
例句：
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1. Thepopulation of the city has experienced a spontaneousdoubling in recent years.
近年来，该市的人口经历了自发加倍。
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2. This phenomenonis often associated with spontaneous doublingin the growth of certain species.
这种现象通常与某些物种的自发加倍生长有关。
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3.The researchers found that this spontaneous doubling could be due to changes in theenvironment.
研究人员发现，这种自发加倍可能是由于环境变化引起的。