程序开始运行时显示一电视机屏幕，屏幕旁边有一排按钮，其中包括放映、快进、倒退、停止。当按下放映按钮时，电视屏幕中应有一个动画-Proceedings began running a TV screen display, the screen next to a row of buttons, including screening, fast forward, backward, stop. When the press screening button, there should be a T