名词
中文翻译：初产妇分娩的原因
同义词：
['primary cause of labor', 'initial factor of labor']
例句：
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1. The studyfound that the initial cause of labor was due to a lack of prenatal care.
研究发现，初产妇分娩的原因是缺乏产前护理。
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2.The doctor explained that the initial cause of labor was due to an undiagnosed condition.
医生解释说，初产妇分娩的原因是未被诊断出的状况。
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3. The researcher identified several factors that could be the initial cause of labor.
研究者确定了几个可能是初产妇分娩原因的因素。