谁能帮我把新概念第2册第7课，用自己的语言用英语描述下来，急！

some detectives were expecting the arrival of a plane. They were told some thieves were going to steal the diamonds on the plane. After the plane landed,the detectives checked the parcel from the plane. They were shocked to see there was no diamond but stones and sand in the parcel.

Detectives were waiting at the airport all moring. They were excepting a valuable parcel of diamonds from South Africa. Two men took the parcel into the Customs House after the arrival of the plane. Two detectives opened it. The parcel was full of stones and sand.