该系统实现的是打字游戏功能，从屏幕顶端随机出现字母，用户单击键盘正确匹配字母则字母消失，其中界面设计用到了GDI编程-The system implementation is typing game features random letters from the top of the screen, the user clicks on the keyboard to match the correct letter is the letter disappeared, which used