One congressman here in the United States thinks that the entire investment that the U.S. put into smallpox eradication pays itself off every 26 days -- in foregone treatment costs and vaccination costs.
美国一位国会议员认为 美国投入的 用以根除天花的全部投资 每26天就能收回一次成本 通过抵消治疗成本 和疫苗的成本