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为了估价经济危机对卫生费用所造成的影响,我们特比较下面两组时间——1970年至1974年、1976年至1980年这两个时期内卫生费用结构的变化:
In order to assess the impact of the economic crisis on health costs, we specifically compare the following two groups of time--changes in the structure of health costs during the two periods from 1970 to 1974 and from 1976 to 1980: