并用面向对象的程序设计方法，设计了实现点、线、面符号库的程序类结构。

And a structure of program class is also designed by means of Object_Oriented design.

youdao

并用面向对象的程序设计方法，设计了实现点、线、面符号库的程序类结构。

And a structure of program class is also designed by means of Object_Oriented design.

youdao