相关setback的文学知识

Howseriousisthissetback?Thatwouldbeaseveresetback.Youlikelywillhaveanoccasionalsetback.Thesetbackdidnotdamphiszest.Hemetwithmanyasetbackinhislifetime.Asetback,itturnedout,butnotragedy.Itisanunexpected...