名词短语
中文翻译：Unknown
同义词：
['cause of death', 'underlying factor of death', 'root cause of death']
例句：
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1. The investigation into the incident revealed that the underlying cause was a lack of training.
对这一事件的调查揭示了根本原因是缺乏培训。
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2. The doctors found that the patient's underlying cause was a heart condition.
医生发现患者的死因是心脏病。
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3. The researcher identified the underlying cause as genetic mutations.
研究者发现了死因是基因突变。