Therewereoncetwobrotherswholivedonthe80thlevel.Oncoming...
問題詳情：Therewereoncetwobrotherswholivedonthe80thlevel.Oncominghomeoneday,theyrealizedthattheliftwasn’tworkingandthattheonlychoicewasthestairway.Bythetimetheyreachedthe20thfloor,theywerebreathingquic...