名词短语
中文翻译：自然感染的焦点
同义词：
['natural focus of infection', 'natural point of infection']
例句：
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1. Thestudy focused on the natural focus of infection in the population.
该研究专注于人群中自然感染的焦点。
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2. The researcher found that the natural focus of infection varied by region.
研究者发现，不同地区的自然感染焦点有所不同。
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3. The outbreak was a result of the natural focus of infection in the community.
这次疫情是由于社区中自然感染焦点的结果。