肆虐人间几千年！流感病毒变异有多快？It has ravaged the world for thousands of years! How fast do flu viruses mutate?

新冠刚消停，流感又来了！从今年 1 月份到现在，流感时不时就出现在热搜上。和刚诞生几年的新冠不同，流感那可是和人类共存上千年的老朋友了。为什么流感几千年一直“阴魂不散”？我们怎么就防不住它？流感病毒到底有多狡猾？
As soon as the covid stopped, the flu came again! From January of this year until now, the flu has been on the trends from time to time. Unlike the covid, which has just been born for a few years, influenza is an old friend who has coexisted with humans for thousands of years. Why has the flu been around for thousands of years? Why can't we prevent it? How sneaky is the flu virus?

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