英语翻译This installation consumes 2.2 MJ/t ofMK,which is 80% less than the energy consumed during cement production .前者比后者少消耗80%的能量还是前者是后者的80%.

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英语翻译
This installation consumes 2.2 MJ/t ofMK,which is 80% less than the energy consumed during cement production .前者比后者少消耗80%的能量还是前者是后者的80%.

前者是后者的20%
如果是A consumes 2.2 MJ/t ofMK,which is 80% of B 才是A是B的80%