They carried with them diseases like measles, influenza, and smallpox that their people had gradually acquired genetic resistance to over thousands of years of dense civilization, agriculture, and livestock domestication.
他
携带了麻疹、流感和天花等疾病,他
的人民在数千年的密集文明、农业和牲畜驯化中逐渐获得了对这些疾病的遗传抵抗力。