great flu epidemic
流感大流行
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It is sometimes called the Great Swine Flu epidemic and sometimes the Great Spanish Flu epidemic, but in either case it was ferocious.
那种病有时候被称之为“猪大流感”，有时候被称之为“西班牙大流感”，但无论如何是很凶猛的。
youdao
The final great epidemic of the 20th Century was Russian flu, which hit Britain in 1977.
BBC: The flu virus that nearly killed me
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