In the previous influenza pandemics of 1918 and 1957, mortality seemed to be higher in pregnant women than in non-pregnant populations ...

在1918年和1957年的流感大流行中，怀孕女性的死亡率较之未孕女性似乎更高……

youdao

Influenza pandemics, whether moderate or severe, are remarkable events because of the almost universal susceptibility of the world's population to infection.

无论是温和的，还是严重的，流感大流行都是值得注意的大事，因为世界上的所有人口几乎都普遍易于感染流感。

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Research on influenza pandemics and pandemic viruses increased considerably following the first human cases of infection with the H5N1 avian influenza virus in 1997.

在1997年发现首批人患H5N1禽流感病毒感染病例之后，大大加强了对流感大流行和大流行性病毒的研究力度。

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The World Health Organization, the United Nations health agency, uses a system of six phases to warn of possible influenza pandemics.

VOA: special.2009.05.06

There were three influenza pandemics in the 20th century.

VOA: standard.2009.05.14

Historical records of previous influenza pandemics, as well as experience with SARS, have validated this point.

UNESCO: CONFINTEA VI

He cited matters related to regional financial security and public health security such as the avian flu and influenza pandemics as examples of areas where more dynamism was needed.

CNN: Highlights from the world's press

Well the effects of globalisation and our interdependence with other countries, the new network electronic communications means that we're also vulnerable in other ways - cyber attack bringing down the networks, pandemics, influenza, the First World War, DNA's now on the Internet, energy policy - all of these bring insecurities and potential threats to our country quite apart from...

BBC: John Reid MP, Former Cabinet Minister