Periods when diseases spread around the world are called pandemics.

疾病在全世界范圍內(nèi)傳播時期稱為大流行.

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Since then, there have been a total of eight cholera pandemics.

從那時開始, 霍亂大流行總共爆發(fā)過8次.

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Previous pandemics have been characterized by waves of activity spread over months.

以往大流行的特點是一波接一波的流行持續(xù)數(shù)月之久.

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Pandemics, plagues and pestilence have beset humans throughout history.

傳染病 、 瘟疫和鼠疫困擾著整個人類歷史.

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Both flu pandemics and global warming are lethal.

全球變暖和流感瘟疫一樣是致命的.

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They focus on type A, which tends to cause more severe disease and pandemics.

科學家們把重點集中在了A型流感上, 因為它往往會造成更嚴重的疾病和流行病.

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The other two flu pandemics of the 20 th century, however, were far milder.

20世紀的另外兩次流感流行的病死率則溫和得多.

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