它在中国和世界其他地区传播。
纸的使用传到了国外,促进了其他文明记载和传播他们的思想。
The use of paper spread abroad, helping other cultures record and spread their ideas.
这便提出了有关病毒其他传播途径和潜在感染储主的问题,如自由放养的鸭子,”他补充道。
This raises questions about other ways of virus transmission and potential reservoirs of infection, like in free ranging ducks,” he added.
But it can be acquired in the air, from patients that are from- from other individuals that are infected.
天花会通过空气传播,通过病人和其他感染者呼出的空气传播
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