- 问题详情:My11-year-oldsonandIridebikestoandfromhisschooleveryday.Iaccompanyhimonthe20-minuteridethroughManhattan,drophimoffandreturnattheendofdaytopickhimup.Wealwaysridetogether;sometimesheleads;sometimesIdo.Andasweride,wecommunicatethewaystominimizet...
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