- 問題詳情:Abuld-it-yourselfsolarstill(蒸餾器)isoneofthebestwaystoobtaindrinkingwaterinareaswheretheliquidisnotreadilyavailable.DevelopedbytwodoctorsintheU.S.DepartmentofAgriculture,it’sanexcellentwatercollector.Unfortunately,youmustcarrythenecessaryequi...
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