translation.en: We had evolution over time, and this unbelievable mortality rate in human beings: 55 percent of people who have become infected with H5N1 have, in fact, succumbed.
translation.zh: 随着时间的流逝病毒进化了， 流感对人类的难以置信的病死率也“进化”了。 事实上，55%感染了H5N1病毒