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![Aboutacenturyago,theaveragelife-span(壽命)forAmericanswas...]( "Aboutacenturyago,theaveragelife-span(壽命)forAmericanswas...")
Aboutacenturyago,theaveragelife-span(壽命)forAmericanswas...
問題詳情：Aboutacenturyago,theaveragelife-span(壽命)forAmericanswasabout50years.Today,thetypicalAmericanlivesforaroundseventy-eightyears.AccordingtoaGermanagingstudy,themaximumlifespaninindustrializedco...
