众所周知,流行病的发生有周期性,每隔几十年、几百年就会发生一场大灾难,像个定时闹钟一样随时发作,却不知道时间会被调到何时。回顾上世纪困扰人类的七大瘟疫,不论是已经被攻克的,还是未被攻克的,在这个世纪都有可能卷土重来。在下一轮瘟疫爆发之前,有必要审视过去,这样我们才 As we all know, the epidemic is cyclical. Every few decades and centuries there will be a catastrophe that will happen at any time like a regular alarm clock without knowing when the time will be transferred. Recalling the seven plagues plaguing mankind in the last century, whether they have been overcome or not yet taken over, are likely to come back in this century. Before the next plague outbreaks, it is necessary to look at the past so that we can