One reason for the success of smallpox eradication was a constant use of research to guide increasingly refined strategic operations.
得以成功根除天花的一项原因是，我们自始至终利用研究成果指导日益复杂的战略行动。
One reason for the success of smallpox eradication was a constant use of research to guide increasingly refined strategic operations.
得以成功根除天花的一项原因是，我们自始至终利用研究成果指导日益复杂的战略行动。
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