Influenza pandemics are caused by new influenza viruses that have adapted to humans.
流感大流行由新的可在人群中传染的病毒所引起。
They also involve poverty, pandemics and natural disasters affecting the planet.
它们还涉及到影响全球的贫穷、流行病和自然灾害。
Pandemics, plagues and pestilence have beset humans throughout history.
传染病, 瘟疫和鼠疫困扰着整个人类历史。
Previous pandemics have been characterized by waves of activity spread over months.
以往大流行的特点是一波接一波的流行持续数月之久。
Since then,there have been a total of eight cholera pandemics.
从那时开始，霍乱大流行总共爆发过8次。
Those were considered to be mild pandemics.
而这两次仅被视为轻度大流行。
As with pandemics and financial crises, they are not open to negotiation.
与传染病和金融危机一样，它们是不容商议的。
As I said, pandemics are unpredictable and prone to deliver surprises.
如我所说, 大流行是变幻莫测的, 往往令人猝不及防。
Localised epidemics and global pandemics periodically pose a significant national and global threat.
局部和全球的的流行病时不时的威胁着我们。
Epidemics of infectious disease can escalate into pandemics, but do not always do so.
传染性疾病的流行能够升级至大流行疫情, 但也不总是这样。
During the last century, the influenza viruses have undergone major genetic changes resulting in influenza pandemics.
上世纪流感病毒经过遗传学的改变导致流感大流行。
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