名词短语
中文翻译：感染的源头
同义词：
['source of infection', 'etiology of infection例句：1. The study found that the origin of the disease was linked to environmental factors.（研究发现，这种疾病的起源与环境因素有关。）']
例句：
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1. The study found that the origin of the disease was linked to environmental factors.
研究发现，这种疾病的起源与环境因素有关。
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2.The doctor explained that the origin of the patient's symptoms was due to a bacterial infection.
医生解释说，病人症状的原因是由细菌感染引起的。
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3. The researcher traced the origin of the virus to an outbreak in a nearby village.
研究人员追踪到病毒起源于附近的一个村庄爆发疫情。