课文内容：
The plane was late and detectives were waiting atthe airport all morning. They were expecting avaluable parcel of diamond from South Africa. Afew hours earlier, someone had told the police thatthieves would try to steal the diamonds. When theplane arrived, some of the detectives werewaiting inside the main building while otherswere waiting on the airfield. Two men took theparcel off the plane and carried it into the Customs House. While two detectives werekeeping guard at the door, two others opened the parcel. To their surprise, theprecious parcel was full of stones and sand!
精讲笔记：
4、When the plane arrived, some of the detectives were waiting inside the mainbuilding while others were waiting on the airfield.
当飞机到达时，部分侦探在主机楼里等着，其余的全在停机坪山守候着。
语言点1 比较学习:when,as while
1)when既可接延续性动词，又可接非延续性动词。
When the wind blows up, all the windows rattle.只要一刮风，所有的窗户都吱吱地响。
2)as用法非常灵活，经常可以替换when。
As I came home, my mother was cooking supper.我回家时，我妈妈正在做晚饭。
3)while多接延续性动词。
While the manager was walking down the sreet, I followed him.当经理在街上走路时，我跟着他。
语言点2 others=other+名词,这里的others相当于other detectives,指其余的侦探。
5、Two men took the parcel off the plane and carried it into the Customs House.
两个人把装有钻石的小包从飞机上取了下来，进了海关。
语言点1 take sth. off somewhere=take sth. down from somewhere=take sth.away fromsomewhere把某物从某处拿下来
The teacher took one book down from the shelf.老师把一本书从书架上取了下来。
语言点2 carry sth. into somewhere把某物拿进某地
Please carry the rice into the kitchen.请把大米扛到厨房里。
6、While two detectives were keeping guard at the door, two others opened theparcel.
当两位侦探守住门口时，另外的两位侦探打开了包裹。
语言点1 keep guard at the door把门，守门
语言点2 关于“在……旁”的表达：
1)near在附近(可近可远)
2)by在……边
3)next to紧挨着，紧紧相连
4)at在……旁(常接门、窗、桌子)
5)beside在……旁边
7、To their surprise, the precious parcel was full of stones and sand!
让他们吃惊的是，这个所谓的贵重的包裹里面被塞满了石头和沙子!
语言点1 to one's surprise让某人吃惊的是
To his surprise, I gave him two glasses of beer immediately.让他感到意外的是，我马上给了他两杯啤酒。
类似结构的表达有：to one's amusement让某人感到好笑的是
to one's disgust令人反感的是
语言点2 be full of sth.充满某物
The small ship is full of water.这条小船里全是水。
