Twomenarewalkinginthepark.OneisMr.Brown,aworker,theothe...
問題詳情：Twomenarewalkinginthepark.OneisMr.Brown,aworker,theotherisMr.Black.Mr.Brownisgoingtoachair.Itisnexttotheroad.Mr.Blackisafterhim.Mr.BrownfindsMr.Black.NowMr.Blackbeginstowalkfaster(更快).Becaus...