LastsummerIlearnttorideabicycle.Atfirst,Iwasabletocontr...
問題詳情：LastsummerIleatorideabicycle.Atfirst,Iwasabletocontrolitsdirection.SometimesIfalltotherightortotheleft.Iwasworrying,askingmyfatherimpatientlywhyhecouldn’tridestraight.Sohedidn’tanswermedirec...