Once the virus becomes a pandemic influenza, your trouble will only begin.一旦病毒成为全国流行的流感，你的麻烦才真正开始了。They feared a new cholera pandemic.他们担心霍乱再次流行。In some parts of the world malaria is still pandemic.在世界上一些地区疟疾仍在大规模流行。Scientists believe we are due another flu pandemic.科学家认为我们会经历又一次流感大暴发。