Theworlditselfisbecomingmuchsmallerbyusingmoderntraf...
问题详情: Theworlditselfisbecomingmuchsmallerbyusingmoderntrafficandmoderncommunicationmeans.Lifetodayismucheasierthanitwashundredsofyearsago,butithasbroughtnewproblems.Oneofthebiggestproblemsispo...