名词
中文翻译：感染密度
同义词：
['infection density', 'infection load']
例句：
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1.The study found that the density of infection was higher in urban areas.
研究发现，城市地区的感染密度更高。
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2. The doctor advised against unnecessary surgeries due to the high infection density in the hospital.
医生建议避免不必要的手术，因为医院里的感染密度很高。
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3. The researchers focused on understanding the density of infection in different populations.
研究人员专注于理解不同人群中的感染密度。