WhenIwasachildIhadam的精選

問題詳情：WhenIwasachildIhadamodelrailwayset.AsIdrovemytrainaroundthetrackIsetmyself 21 goals:“Keepthetrainataconstantspeed”and“letittravelas 22  asIcan”.Thiswasfunandexciting.Finally,Iwas 23...