为什么这篇英语课文我背了两天都背不出?

为什么这篇英语课文我背了两天都背不出?
The plane was late and detectives were waiting at the airport all morning.They were expecting a valuable parcel of diamond from South Africa.A few hours earlier,someone had told the police that thieves would try to steal the diamonds.When the plane arrived,some of the detectives were waiting inside the main building while others were waiting on the airfield.Two men took the parcel off the plane and carried it into the Customs House.While two detectives were keeping guard at the door,two others opened the parcel.To their surprise,the precious parcel was full of stones and sand!
我尝试了很多方法,如抄写、听录音、读,只能知道大概,总是漏掉好多,