学生问：什么叫双黄蛋？
Tyger举例说明。
1.Two men took the parcel off the plane and carried it into the CustomsHouse.
2.I entered the hotel manager's office and sat down.
3.A girl came in and put an envelope on his desk.
4.Tony saw me and came and sat at thesame table.
5.The landlord smiled and immediately went out.
