When Chen Chuan entered the dormitory, a security guard came up to him. "Student, please show your ID."
Chen Chuan took his student card from his pocket and handed it over.
The guard took the card and inserted it into a nearby terminal. An indicator light flashed on. He then punched a few keys according to a color code, and with a few clicks, a slip of paper with Chen Chuan's name printed on it emerged.
The guard returned the Name Card and the slip to him, saying, "Chen, this is your entry slip for today. Please keep it safe. Your dorm is room four, area one, on the seventh floor."
Chen Chuan said thanks and headed for the stairs, only to discover that the dormitory building actually had an elevator. There didn't seem to be anyone around at this time, so he walked over and pressed the button. With a characteristic metallic grinding, the grille door rattled open. He stepped inside, pressed the button for the seventh floor, and the elevator lurched upwards.
