Wars kill millions of people. But war is not the only cause of large-scale death. 700 years ago a terrible disease called the Bubonic Plague killed more than 40 million people. In Europe it killed 1 person in 3.

战争夺走了数百万人的生命。可战争不是大规模死亡的唯一成因。700多年前的一种叫黑死病的可怕疾病夺走了超过4000万人的生命。在欧洲，三个人中就有一人死于这种病。