Theairwebreatheisfreelyavailable,without71wecouldnotsur...
问题详情：Theairwebreatheisfreelyavailable,without71wecouldnotsurvivemorethanafewminutes.Forthemostpart,airisavailabletoeveryone,andeveryoneneedsit.Somepeopleusetheairtosustainthemwhile 72 (sit)around...