说明：  t c l / t k的真正功能在于，利用t c l脚本语言几乎完全可以编写复杂的图形应用程序，因而避开了利用C语言编写界面时所遇到的界面编程的许多复杂性。
(tcl/tk is the real function, use tcl scripting language can be written almost entirely complex graphics application, and thus avoid the use of C language interface, the interface encountered by many of the complexity of programming.)