pandemics
n.
（全国或全球性）流行病，大流行病( pandemic的名词复数 );
例句:
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Periods when diseases spread around the world are called pandemics.
疾病在全世界范围内传播时期称为大流行.
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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.
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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.
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But there is no reason to think that pandemics are behind us.
来自NEWYORKER
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Pandemics are not new they have happened at different points throughout human history.
来自SA
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Population will decrease when the inevitable wars, pandemics, famine, etc.
来自SA