Could the eradication of smallpox have been a factor in the spread of HIV?
HIV传播的原因之一是不是因为天花被根除了呢？
What factor helped to spread the disease of myxomatosis?
什么因素助长了多发性粘液瘤疾病的蔓延？
What factor helps to spread the disease of myxomatosis?
什么因素有助于扩散多发性粘液瘤病毒？
Human mobility is a factor behind the spread of infectious diseases.
流动人口是导致传染病扩散的其中一个重要因素。
Human mobility is a factor behind the spread of infectious diseases.
流动人口是导致传染病扩散的其中一个重要因素。
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