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1.Smallpox is a highly contagious disease that can be transmitted through close contact with infected individuals.
天花是一种高度传染性的疾病，可以通过与感染者密切接触传播。
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2.The smallpox vaccine has been widely used to prevent the disease since the 1960s.
自20世纪60年代以来，天花疫苗已被广泛用于预防该疾病。
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3. In the past, smallpox was a major cause of death in many societies due to its high mortality rate.
过去，天花因其高死亡率成为许多社会的主要死亡原因。