Drag-and-drop can be very difficult for users to master on a touch screen, making it inappropriate for kiosk users who will never spend enough time to master demanding interaction idioms.

• 在触摸屏上很难掌握拖放操作，因此信息亭的使用者基本上从来不会花费时间在触摸屏上学习和练习这种操作。