N-COUNT
（疾病的）大流行，广泛传播
A pandemic is an occurrence of a disease that affects many people over a very wide area.
例句
They feared a new cholera pandemic...
他们担心新一轮的霍乱大流行。
One pandemic of Spanish flu took nearly 22 million lives worldwide.
西班牙流感的大爆发夺去了全球近2,200万人的生命。