说明：  这个教程介绍了使用Qt工具包进行图形用户界面编程。它没有包括所有的东西：强调的是教授一种图形用户界面编程的编程思想，并且介绍Qt的特征也是必需的。一些通常情况下使用的特征在这个教程里没有用到。
(This tutorial introduces the graphical user interface programming using the Qt toolkit. It does not include all things: to emphasize is the professor of a graphical user interface programming, programming ideas, and Qt' s characteristics is required. Feature usually is not used in this tutorial.)