相關setback的文學知識

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