流感的世界性大规模爆发似乎每隔几十年就会出现一次，每次都夺走上百万人的

流感的世界性大规模爆发似乎每隔几十年就会出现一次，每次都夺走上百万人的生命
—— 1968年至少有一百万人死于流感；1918-1919年的“西班牙”流感(Spanish flu)
)的死亡人数更是高达1亿人.而即便是那些爆发之初较温和的流感也可能变得危险。这
是因为流感病毒极易发生变异。当某种A型流感病毒发生大的基因改变时，就会生产一
种新的病毒，使人类很难或不能抵抗，从而导致流感大规模爆发。

結果 (英文) 1:

Worldwide influenza outbreak seems to be once every few decades, each claimed the lives of millions of people--1968 at least 1 million people die from the flu; 1918-1919 "Spain" influenza (Spanish flu)) The number of deaths is as high as 100 million people. even those milder flu at the beginning of the outbreak may also become dangerous. ThisBecause the influenza virus easily mutates. When a type a influenza virus gene changes, will produce aNew virus makes it difficult for humans or is unable to resist, resulting in a flu outbreak.

結果 (英文) 3:

A global outbreak of influenza seems to occur every few decades, killing millions of people at a time. At least one million people died in 1968. 1918-1919 (flu Spanish) has been more than 1 people in the world. This is because the flu virus is very easy to change. When a certain type of influenza A virus changes, it will produce a new kind of virus, which makes it difficult or unable to resist human beings, which led to a large outbreak of influenza.